CVE-2021-26411 (GCVE-0-2021-26411)
Vulnerability from cvelistv5 – Published: 2021-03-11 15:07 – Updated: 2026-10-01 20:31Title
Internet Explorer Memory Corruption Vulnerability
Summary
Internet Explorer Memory Corruption Vulnerability
Severity
SSVC
Exploitation: active
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 03:55 UTC
CWE
- Remote Code Execution
- CWE-416 - Use After Free
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
| https://portal.msrc.microsoft.com/en-US/security-… | x_refsource_MISCx_transferred |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Internet Explorer 11 |
Affected:
1.0.0 , < 10.0.17134.2087
(custom)
|
|
| Microsoft | Internet Explorer 9 |
Affected:
1.0.0 , < 6.0.6003.21070
(custom)
|
|
| Microsoft | Microsoft Edge (EdgeHTML-based) |
Affected:
1.0..0 , < 10.0.17134.2087
(custom)
|
Date Public
2021-03-09 16:00
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 3ce94cba-1bd3-4916-bed2-8155f44cf0e0
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: Microsoft Internet Explorer Memory Corruption Vulnerability | Affected: Microsoft / Internet Explorer | Description: Microsoft Internet Explorer contains an unspecified vulnerability that allows for memory corruption. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Known | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-26411
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-416 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Internet Explorer |
| Due Date | 2021-11-17 |
| Date Added | 2021-11-03 |
| Vendorproject | Microsoft |
| Vulnerabilityname | Microsoft Internet Explorer Memory Corruption Vulnerability |
| Knownransomwarecampaignuse | Known |
References
Created: 2026-10-02 08:10 CEST
| Updated: 2026-10-02 08:10 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 597bcaa0-4538-4fa0-83b4-949f832d147f
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: Internet Explorer Memory Corruption Vulnerability | Affected: Microsoft / Internet Explorer 11, Internet Explorer 9, Microsoft Edge (EdgeHTML-based) | CVSS: 8.8 (HIGH) | EPSS: 0.80765 | Used in malware: yes | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Confirmed Compromise
Confidence: 70%
Source: previdian
Details
| Feed | Previdian (previdian.com) |
|---|---|
| Title | Internet Explorer Memory Corruption Vulnerability |
| Cve Id | CVE-2021-26411 |
| Vendor | Microsoft |
| Ghsa Id | GHSA-C5RH-MMR6-C7CH |
| Product | Internet Explorer 11, Internet Explorer 9, Microsoft Edge (EdgeHTML-based) |
| Added Date | 2021-11-03T00:00:00.000Z |
| Cvss Score | 8.8 |
| Epss Score | 0.80765 |
| Previous Ids | |
| Cvss Severity | HIGH |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.99619 |
| Used In Malware | yes |
| Vulnerability Id | CVE-2021-26411 |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-10-02 09:10 CEST
| Updated: 2026-10-02 09:10 CEST
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-03T20:26:25.344Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26411"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2021-26411",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-12T03:55:30.330990Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2021-11-03",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26411"
},
"type": "kev"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-01T20:31:07.692Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26411"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"platforms": [
"Windows 10 for 32-bit Systems",
"Windows 10 for x64-based Systems",
"Windows 10 Version 1607 for 32-bit Systems",
"Windows 10 Version 1607 for x64-based Systems",
"Windows 10 Version 1803 for 32-bit Systems",
"Windows 10 Version 1803 for ARM64-based Systems",
"Windows 10 Version 1803 for x64-based Systems",
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems",
"Windows 10 Version 1903 for ARM64-based Systems",
"Windows 10 Version 1903 for x64-based Systems",
"Windows 10 Version 1909 for 32-bit Systems",
"Windows 10 Version 1909 for ARM64-based Systems",
"Windows 10 Version 1909 for x64-based Systems",
"Windows 10 Version 2004 for 32-bit Systems",
"Windows 10 Version 2004 for ARM64-based Systems",
"Windows 10 Version 2004 for x64-based Systems",
"Windows 10 Version 20H2 for 32-bit Systems",
"Windows 10 Version 20H2 for ARM64-based Systems",
"Windows 7 for 32-bit Systems Service Pack 1",
"Windows 7 for x64-based Systems Service Pack 1",
"Windows 8.1 for 32-bit systems",
"Windows 8.1 for x64-based systems",
"Windows RT 8.1",
"Windows Server 2008 R2 for x64-based Systems Service Pack 1",
"Windows Server 2012",
"Windows Server 2012 R2",
"Windows Server 2016",
"Windows Server 2019"
],
"product": "Internet Explorer 11",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.17134.2087",
"status": "affected",
"version": "1.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows Server 2008 for 32-bit Systems Service Pack 2",
"Windows Server 2008 for x64-based Systems Service Pack 2"
],
"product": "Internet Explorer 9",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.0.6003.21070",
"status": "affected",
"version": "1.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 for 32-bit Systems",
"Windows 10 for x64-based Systems",
"Windows 10 Version 1607 for 32-bit Systems",
"Windows 10 Version 1607 for x64-based Systems",
"Windows 10 Version 1803 for 32-bit Systems",
"Windows 10 Version 1803 for ARM64-based Systems",
"Windows 10 Version 1803 for x64-based Systems",
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems",
"Windows 10 Version 1903 for ARM64-based Systems",
"Windows 10 Version 1903 for x64-based Systems",
"Windows 10 Version 1909 for 32-bit Systems",
"Windows 10 Version 1909 for ARM64-based Systems",
"Windows 10 Version 1909 for x64-based Systems",
"Windows 10 Version 2004 for 32-bit Systems",
"Windows 10 Version 2004 for ARM64-based Systems",
"Windows 10 Version 2004 for x64-based Systems",
"Windows 10 Version 20H2 for 32-bit Systems",
"Windows 10 Version 20H2 for ARM64-based Systems",
"Windows Server 2016",
"Windows Server 2019"
],
"product": "Microsoft Edge (EdgeHTML-based)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.17134.2087",
"status": "affected",
"version": "1.0..0",
"versionType": "custom"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:internet_explorer:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.0.6003.21070",
"versionStartIncluding": "1.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:internet_explorer:*:-:*:*:*:*:*:*",
"versionEndExcluding": "10.0.17134.2087",
"versionStartIncluding": "1.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:edge:*:*:*:*:*:*:*:*",
"versionEndExcluding": "10.0.17134.2087",
"versionStartIncluding": "1.0..0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"datePublic": "2021-03-09T16:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": "Internet Explorer Memory Corruption Vulnerability"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L/E:P/RL:O/RC:C",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en-US",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "Remote Code Execution",
"lang": "en-US",
"type": "Impact"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:30:50.407Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"name": "Internet Explorer Memory Corruption Vulnerability",
"tags": [
"vendor-advisory",
"patch"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26411"
}
],
"title": "Internet Explorer Memory Corruption Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2021-26411",
"datePublished": "2021-03-11T15:07:28.000Z",
"dateReserved": "2021-01-29T00:00:00.000Z",
"dateUpdated": "2026-10-01T20:31:07.692Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2021-26411",
"date": "2026-10-02",
"epss": "0.80765",
"percentile": "0.9962"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"platforms": [
"Windows 10 for 32-bit Systems",
"Windows 10 for x64-based Systems",
"Windows 10 Version 1607 for 32-bit Systems",
"Windows 10 Version 1607 for x64-based Systems",
"Windows 10 Version 1803 for 32-bit Systems",
"Windows 10 Version 1803 for ARM64-based Systems",
"Windows 10 Version 1803 for x64-based Systems",
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems",
"Windows 10 Version 1903 for ARM64-based Systems",
"Windows 10 Version 1903 for x64-based Systems",
"Windows 10 Version 1909 for 32-bit Systems",
"Windows 10 Version 1909 for ARM64-based Systems",
"Windows 10 Version 1909 for x64-based Systems",
"Windows 10 Version 2004 for 32-bit Systems",
"Windows 10 Version 2004 for ARM64-based Systems",
"Windows 10 Version 2004 for x64-based Systems",
"Windows 10 Version 20H2 for 32-bit Systems",
"Windows 10 Version 20H2 for ARM64-based Systems",
"Windows 7 for 32-bit Systems Service Pack 1",
"Windows 7 for x64-based Systems Service Pack 1",
"Windows 8.1 for 32-bit systems",
"Windows 8.1 for x64-based systems",
"Windows RT 8.1",
"Windows Server 2008 R2 for x64-based Systems Service Pack 1",
"Windows Server 2012",
"Windows Server 2012 R2",
"Windows Server 2016",
"Windows Server 2019"
],
"product": "Internet Explorer 11",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.17134.2087",
"status": "affected",
"version": "1.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows Server 2008 for 32-bit Systems Service Pack 2",
"Windows Server 2008 for x64-based Systems Service Pack 2"
],
"product": "Internet Explorer 9",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.0.6003.21070",
"status": "affected",
"version": "1.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 for 32-bit Systems",
"Windows 10 for x64-based Systems",
"Windows 10 Version 1607 for 32-bit Systems",
"Windows 10 Version 1607 for x64-based Systems",
"Windows 10 Version 1803 for 32-bit Systems",
"Windows 10 Version 1803 for ARM64-based Systems",
"Windows 10 Version 1803 for x64-based Systems",
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems",
"Windows 10 Version 1903 for ARM64-based Systems",
"Windows 10 Version 1903 for x64-based Systems",
"Windows 10 Version 1909 for 32-bit Systems",
"Windows 10 Version 1909 for ARM64-based Systems",
"Windows 10 Version 1909 for x64-based Systems",
"Windows 10 Version 2004 for 32-bit Systems",
"Windows 10 Version 2004 for ARM64-based Systems",
"Windows 10 Version 2004 for x64-based Systems",
"Windows 10 Version 20H2 for 32-bit Systems",
"Windows 10 Version 20H2 for ARM64-based Systems",
"Windows Server 2016",
"Windows Server 2019"
],
"product": "Microsoft Edge (EdgeHTML-based)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.17134.2087",
"status": "affected",
"version": "1.0..0",
"versionType": "custom"
}
]
}
],
"source": "secure@microsoft.com"
}
],
"cisaActionDue": "2021-11-17",
"cisaExploitAdd": "2021-11-03",
"cisaRequiredAction": "Apply updates per vendor instructions.",
"cisaVulnerabilityName": "Microsoft Internet Explorer Memory Corruption Vulnerability",
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:edge:-:*:*:*:*:*:*:*",
"matchCriteriaId": "77D197D7-57FB-4898-8C70-B19D5F0D5BE0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:*",
"matchCriteriaId": "542DAEEC-73CC-46C6-A630-BF474A3446AC",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:*:*",
"matchCriteriaId": "61019899-D7AF-46E4-A72C-D189180F66AB",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:*",
"matchCriteriaId": "00345596-E9E0-4096-8DC6-0212F4747A13",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:*",
"matchCriteriaId": "2E332666-2E03-468E-BC30-299816D6E8ED",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "9E1ED169-6F03-4BD5-B227-5FA54DB40AD7",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "5C5B5180-1E12-45C2-8275-B9E528955307",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:*",
"matchCriteriaId": "A1B570A8-ED1A-46B6-B8AB-064445F8FC4C",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:*",
"matchCriteriaId": "D4DBE5B2-AE10-4251-BCDA-DC5EDEE6EE67",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:*:*",
"matchCriteriaId": "6AFD13A6-A390-4400-9029-2F4058CA17E2",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*",
"matchCriteriaId": "041FF8BA-0B12-4A1F-B4BF-9C4F33B7C1E7",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*",
"matchCriteriaId": "DB79EE26-FC32-417D-A49C-A1A63165A968",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:internet_explorer:11:-:*:*:*:*:*:*",
"matchCriteriaId": "D7809F78-8D56-4925-A8F9-4119B973A667",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1507:-:*:*:*:*:*:*:*",
"matchCriteriaId": "542DAEEC-73CC-46C6-A630-BF474A3446AC",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1607:-:*:*:*:*:*:*:*",
"matchCriteriaId": "61019899-D7AF-46E4-A72C-D189180F66AB",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1803:-:*:*:*:*:*:*:*",
"matchCriteriaId": "00345596-E9E0-4096-8DC6-0212F4747A13",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1809:-:*:*:*:*:*:*:*",
"matchCriteriaId": "2E332666-2E03-468E-BC30-299816D6E8ED",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:arm64:*",
"matchCriteriaId": "9E1ED169-6F03-4BD5-B227-5FA54DB40AD7",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1903:-:*:*:*:*:*:x64:*",
"matchCriteriaId": "5C5B5180-1E12-45C2-8275-B9E528955307",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_1909:-:*:*:*:*:*:*:*",
"matchCriteriaId": "A1B570A8-ED1A-46B6-B8AB-064445F8FC4C",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_2004:-:*:*:*:*:*:*:*",
"matchCriteriaId": "D4DBE5B2-AE10-4251-BCDA-DC5EDEE6EE67",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_10_20h2:-:*:*:*:*:*:*:*",
"matchCriteriaId": "6AFD13A6-A390-4400-9029-2F4058CA17E2",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*",
"matchCriteriaId": "C2B1C231-DE19-4B8F-A4AA-5B3A65276E46",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*",
"matchCriteriaId": "E93068DB-549B-45AB-8E5C-00EB5D8B5CF8",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*",
"matchCriteriaId": "C6CE5198-C498-4672-AF4C-77AB4BE06C5C",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*",
"matchCriteriaId": "AF07A81D-12E5-4B1D-BFF9-C8D08C32FF4F",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*",
"matchCriteriaId": "A7DF96F8-BA6A-4780-9CA3-F719B3F81074",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*",
"matchCriteriaId": "DB18C4CE-5917-401E-ACF7-2747084FD36E",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:*",
"matchCriteriaId": "041FF8BA-0B12-4A1F-B4BF-9C4F33B7C1E7",
"vulnerable": false
},
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:*",
"matchCriteriaId": "DB79EE26-FC32-417D-A49C-A1A63165A968",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
},
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:internet_explorer:9:*:*:*:*:*:*:*",
"matchCriteriaId": "C043EDDD-41BF-4718-BDCF-158BBBDB6360",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
},
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:*",
"matchCriteriaId": "5F422A8C-2C4E-42C8-B420-E0728037E15C",
"vulnerable": false
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Internet Explorer Memory Corruption Vulnerability"
},
{
"lang": "es",
"value": "Una Vulnerabilidad de Corrupci\u00f3n de la Memoria de Internet Explorer"
}
],
"id": "CVE-2021-26411",
"lastModified": "2026-10-01T21:17:16.540",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "HIGH",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "PARTIAL",
"baseScore": 5.1,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "PARTIAL",
"vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:P",
"version": "2.0"
},
"exploitabilityScore": 4.9,
"impactScore": 6.4,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": true
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.3,
"source": "secure@microsoft.com",
"type": "Secondary"
},
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-26411",
"options": [
{
"exploitation": "active"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-12T03:55:30.330990Z",
"version": "2.0.3"
}
}
]
},
"published": "2021-03-11T16:15:13.863",
"references": [
{
"source": "secure@microsoft.com",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26411"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch",
"Vendor Advisory"
],
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26411"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"tags": [
"US Government Resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26411"
}
],
"sourceIdentifier": "secure@microsoft.com",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"vulnrichment": {
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-03T20:26:25.344Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26411"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2021-26411",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-12T03:55:30.330990Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2021-11-03",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26411"
},
"type": "kev"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-02-04T19:14:59.787Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"government-resource"
],
"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26411"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"platforms": [
"Windows 10 for 32-bit Systems",
"Windows 10 for x64-based Systems",
"Windows 10 Version 1607 for 32-bit Systems",
"Windows 10 Version 1607 for x64-based Systems",
"Windows 10 Version 1803 for 32-bit Systems",
"Windows 10 Version 1803 for ARM64-based Systems",
"Windows 10 Version 1803 for x64-based Systems",
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems",
"Windows 10 Version 1903 for ARM64-based Systems",
"Windows 10 Version 1903 for x64-based Systems",
"Windows 10 Version 1909 for 32-bit Systems",
"Windows 10 Version 1909 for ARM64-based Systems",
"Windows 10 Version 1909 for x64-based Systems",
"Windows 10 Version 2004 for 32-bit Systems",
"Windows 10 Version 2004 for ARM64-based Systems",
"Windows 10 Version 2004 for x64-based Systems",
"Windows 10 Version 20H2 for 32-bit Systems",
"Windows 10 Version 20H2 for ARM64-based Systems",
"Windows 7 for 32-bit Systems Service Pack 1",
"Windows 7 for x64-based Systems Service Pack 1",
"Windows 8.1 for 32-bit systems",
"Windows 8.1 for x64-based systems",
"Windows RT 8.1",
"Windows Server 2008 R2 for x64-based Systems Service Pack 1",
"Windows Server 2012",
"Windows Server 2012 R2",
"Windows Server 2016",
"Windows Server 2019"
],
"product": "Internet Explorer 11",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.17134.2087",
"status": "affected",
"version": "1.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows Server 2008 for 32-bit Systems Service Pack 2",
"Windows Server 2008 for x64-based Systems Service Pack 2"
],
"product": "Internet Explorer 9",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "6.0.6003.21070",
"status": "affected",
"version": "1.0.0",
"versionType": "custom"
}
]
},
{
"platforms": [
"Windows 10 for 32-bit Systems",
"Windows 10 for x64-based Systems",
"Windows 10 Version 1607 for 32-bit Systems",
"Windows 10 Version 1607 for x64-based Systems",
"Windows 10 Version 1803 for 32-bit Systems",
"Windows 10 Version 1803 for ARM64-based Systems",
"Windows 10 Version 1803 for x64-based Systems",
"Windows 10 Version 1809 for 32-bit Systems",
"Windows 10 Version 1809 for ARM64-based Systems",
"Windows 10 Version 1809 for x64-based Systems",
"Windows 10 Version 1903 for ARM64-based Systems",
"Windows 10 Version 1903 for x64-based Systems",
"Windows 10 Version 1909 for 32-bit Systems",
"Windows 10 Version 1909 for ARM64-based Systems",
"Windows 10 Version 1909 for x64-based Systems",
"Windows 10 Version 2004 for 32-bit Systems",
"Windows 10 Version 2004 for ARM64-based Systems",
"Windows 10 Version 2004 for x64-based Systems",
"Windows 10 Version 20H2 for 32-bit Systems",
"Windows 10 Version 20H2 for ARM64-based Systems",
"Windows Server 2016",
"Windows Server 2019"
],
"product": "Microsoft Edge (EdgeHTML-based)",
"vendor": "Microsoft",
"versions": [
{
"lessThan": "10.0.17134.2087",
"status": "affected",
"version": "1.0..0",
"versionType": "custom"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:microsoft:internet_explorer:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.0.6003.21070",
"versionStartIncluding": "1.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:internet_explorer:*:-:*:*:*:*:*:*",
"versionEndExcluding": "10.0.17134.2087",
"versionStartIncluding": "1.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:microsoft:edge:*:*:*:*:*:*:*:*",
"versionEndExcluding": "10.0.17134.2087",
"versionStartIncluding": "1.0..0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"datePublic": "2021-03-09T16:00:00.000Z",
"descriptions": [
{
"lang": "en-US",
"value": "Internet Explorer Memory Corruption Vulnerability"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L/E:P/RL:O/RC:C",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en-US",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "Remote Code Execution",
"lang": "en-US",
"type": "Impact"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-19T16:30:50.407Z",
"orgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"shortName": "microsoft"
},
"references": [
{
"name": "Internet Explorer Memory Corruption Vulnerability",
"tags": [
"vendor-advisory",
"patch"
],
"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26411"
}
],
"title": "Internet Explorer Memory Corruption Vulnerability"
}
},
"cveMetadata": {
"assignerOrgId": "f38d906d-7342-40ea-92c1-6c4a2c6478c8",
"assignerShortName": "microsoft",
"cveId": "CVE-2021-26411",
"datePublished": "2021-03-11T15:07:28.000Z",
"dateReserved": "2021-01-29T00:00:00.000Z",
"dateUpdated": "2026-10-01T20:31:07.692Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…