CVE-2021-20023 (GCVE-0-2021-20023)
Vulnerability from cvelistv5 – Published: 2021-04-20 11:55 – Updated: 2026-10-01 20:20Summary
SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host.
Severity
4.9 (Medium)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 03:55 UTC
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://psirt.global.sonicwall.com/vuln-detail/SN… | x_refsource_CONFIRM |
| https://www.cisa.gov/known-exploited-vulnerabilit… | government-resource |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SonicWall | Email Security |
Affected:
10.0.9 and earlier
|
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: cb923c9a-aa14-4873-b89b-444eca397f29
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: SonicWall Email Security Path Traversal Vulnerability | Affected: SonicWall / SonicWall Email Security | Description: SonicWall Email Security contains a path traversal vulnerability that allows a post-authenticated attacker to read files on the remote host. This vulnerability has known usage in a SonicWall Email Security exploit chain along with CVE-2021-20021 and CVE-2021-20022 to achieve privilege escalation. | 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-2021-20023
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-22 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | SonicWall Email Security |
| Due Date | 2021-11-17 |
| Date Added | 2021-11-03 |
| Vendorproject | SonicWall |
| Vulnerabilityname | SonicWall Email Security Path Traversal 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: 29482989-cdf4-4a11-99f5-e4c4539ad186
Exploited: Yes
Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the... | Affected: SonicWall / Email Security | CVSS: 4.9 (MEDIUM) | EPSS: 0.51407 | 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 | SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the... |
| Cve Id | CVE-2021-20023 |
| Vendor | SonicWall |
| Ghsa Id | None |
| Product | Email Security |
| Added Date | 2021-11-03T00:00:00.000Z |
| Cvss Score | 4.9 |
| Epss Score | 0.51407 |
| Previous Ids | |
| Cvss Severity | MEDIUM |
| Virtual Patch | False |
| Cvss Estimated | False |
| Epss Percentile | 0.9891 |
| Used In Malware | yes |
| Vulnerability Id | CVE-2021-20023 |
| 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
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{
"other": {
"content": {
"id": "CVE-2021-20023",
"options": [
{
"Exploitation": "active"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-08-12T03:55:24.717669Z",
"version": "2.0.3"
},
"type": "ssvc"
}
},
{
"other": {
"content": {
"dateAdded": "2021-11-03",
"reference": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20023"
},
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}
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"dateUpdated": "2025-02-06T19:51:33.800Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
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"government-resource"
],
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}
],
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"lang": "en",
"time": "2021-11-03T00:00:00.000Z",
"value": "CVE-2021-20023 added to CISA KEV"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
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"product": "Email Security",
"vendor": "SonicWall",
"versions": [
{
"status": "affected",
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}
]
}
],
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"lang": "en",
"value": "SonicWall Email Security version 10.0.9.x contains a vulnerability that allows a post-authenticated attacker to read an arbitrary file on the remote host."
}
],
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{
"descriptions": [
{
"cweId": "CWE-22",
"description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
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"orgId": "44b2ff79-1416-4492-88bb-ed0da00c7315",
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],
"url": "https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0010"
}
],
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"STATE": "PUBLIC"
},
"affects": {
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},
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"dateReserved": "2020-12-17T00:00:00.000Z",
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}
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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.
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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.
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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.
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