CWE-476
AllowedNULL Pointer Dereference
Abstraction: Base · Status: Stable
The product dereferences a pointer that it expects to be valid but is NULL.
6769 vulnerabilities reference this CWE, most recent first.
CVE-2021-44224 (GCVE-0-2021-44224)
Vulnerability from cvelistv5 – Published: 2021-12-20 11:20 – Updated: 2024-08-04 04:17- CWE-476 - NULL Pointer Dereference
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
2.4.7 , < Apache HTTP Server 2.4*
(custom)
|
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CVE-2021-43824 (GCVE-0-2021-43824)
Vulnerability from cvelistv5 – Published: 2022-02-22 22:15 – Updated: 2025-04-23 19:01- CWE-476 - NULL Pointer Dereference
| URL | Tags |
|---|---|
| https://github.com/envoyproxy/envoy/security/advi… | x_refsource_CONFIRM |
| https://github.com/envoyproxy/envoy/commit/937133… | x_refsource_MISC |
| Vendor | Product | Version | |
|---|---|---|---|
| envoyproxy | envoy |
Affected:
>= 1.20.0, < 1.20.2
Affected: >= 1.19.0, < 1.19.3 Affected: < 1.18.6 Affected: >= 1.21.0, < 1.21.1 |
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CVE-2021-43750 (GCVE-0-2021-43750)
Vulnerability from cvelistv5 – Published: 2021-12-20 20:08 – Updated: 2025-04-23 19:16- CWE-476 - NULL Pointer Dereference (CWE-476)
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CVE-2021-43749 (GCVE-0-2021-43749)
Vulnerability from cvelistv5 – Published: 2021-12-20 20:08 – Updated: 2025-04-23 19:17- CWE-476 - NULL Pointer Dereference (CWE-476)
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CVE-2021-43748 (GCVE-0-2021-43748)
Vulnerability from cvelistv5 – Published: 2021-12-20 20:08 – Updated: 2025-04-23 19:17- CWE-476 - NULL Pointer Dereference (CWE-476)
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Vulnerability from cvelistv5 – Published: 2021-11-22 15:33 – Updated: 2025-04-23 19:18- CWE-476 - NULL Pointer Dereference (CWE-476)
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| https://helpx.adobe.com/security/products/incopy/… | x_refsource_MISC |
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CVE-2021-42733 (GCVE-0-2021-42733)
Vulnerability from cvelistv5 – Published: 2021-11-22 15:22 – Updated: 2025-04-23 19:19- CWE-476 - NULL Pointer Dereference (CWE-476)
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| https://helpx.adobe.com/security/products/bridge/… | x_refsource_MISC |
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CVE-2021-42528 (GCVE-0-2021-42528)
Vulnerability from cvelistv5 – Published: 2022-05-02 22:24 – Updated: 2025-11-03 19:26- CWE-476 - NULL Pointer Dereference (CWE-476)
| Vendor | Product | Version | |
|---|---|---|---|
| Adobe | XMP Toolkit |
Affected:
unspecified , ≤ 2021.07
(custom)
Affected: unspecified , ≤ None (custom) |
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CVE-2021-42373 (GCVE-0-2021-42373)
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"url": "https://security.netapp.com/advisory/ntap-20211223-0002/"
},
{
"tags": [
"x_transferred"
],
"url": "https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "busybox",
"vendor": "busybox",
"versions": [
{
"lessThan": "1.34.0",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A NULL pointer dereference in Busybox\u0027s man applet leads to denial of service when a section name is supplied but no page argument is given"
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-476",
"description": "CWE-476",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2023-04-25T00:00:00.000Z",
"orgId": "48a46f29-ae42-4e1d-90dd-c1676c1e5e6d",
"shortName": "JFROG"
},
"references": [
{
"url": "https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/"
},
{
"name": "FEDORA-2021-5a95823596",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/"
},
{
"name": "FEDORA-2021-c52c0fe490",
"tags": [
"vendor-advisory"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/"
},
{
"url": "https://security.netapp.com/advisory/ntap-20211223-0002/"
},
{
"url": "https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "48a46f29-ae42-4e1d-90dd-c1676c1e5e6d",
"assignerShortName": "JFROG",
"cveId": "CVE-2021-42373",
"datePublished": "2021-11-15T00:00:00.000Z",
"dateReserved": "2021-10-14T00:00:00.000Z",
"dateUpdated": "2024-08-04T03:30:38.267Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
Mitigation MIT-56
For any pointers that could have been modified or provided from a function that can return NULL, check the pointer for NULL before use. When working with a multithreaded or otherwise asynchronous environment, ensure that proper locking APIs are used to lock before the check, and unlock when it has finished [REF-1484].
Mitigation
Select a programming language that is not susceptible to these issues.
Mitigation
Check the results of all functions that return a value and verify that the value is non-null before acting upon it.
Mitigation
Identify all variables and data stores that receive information from external sources, and apply input validation to make sure that they are only initialized to expected values.
Mitigation
Explicitly initialize all variables and other data stores, either during declaration or just before the first usage.
No CAPEC attack patterns related to this CWE.