Common Weakness Enumeration
CWE-416
AllowedUse After Free
Abstraction: Variant · Status: Stable
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
9813 vulnerabilities reference this CWE, most recent first.
CVE-2021-21033 (GCVE-0-2021-21033)
Vulnerability from cvelistv5 – Published: 2021-02-11 19:42 – Updated: 2024-09-16 20:21
VLAI
EPSS
VEX
Title
Acrobat Reader DC Use-After-Free Vulnerability Could Lead To Arbitrary Code Execution
Summary
Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by a Use After Free vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Severity
8.8 (High)
CWE
- CWE-416 - Use After Free (CWE-416)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://helpx.adobe.com/security/products/acrobat… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Adobe | Acrobat Reader |
Affected:
unspecified , ≤ 2020.013.20074
(custom)
Affected: unspecified , ≤ 2020.001.30018 (custom) Affected: unspecified , ≤ 2017.011.30188 (custom) Affected: unspecified , ≤ None (custom) |
Date Public
2021-02-09 00:00
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CVE-2021-21028 (GCVE-0-2021-21028)
Vulnerability from cvelistv5 – Published: 2021-02-11 19:42 – Updated: 2024-09-17 03:58
VLAI
EPSS
VEX
Title
Acrobat Reader DC Use-After-Free Vulnerability Could Lead To Arbitrary Code Execution
Summary
Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by a Use After Free vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Severity
8.8 (High)
CWE
- CWE-416 - Use After Free (CWE-416)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://helpx.adobe.com/security/products/acrobat… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Adobe | Acrobat Reader |
Affected:
unspecified , ≤ 2020.013.20074
(custom)
Affected: unspecified , ≤ 2020.001.30018 (custom) Affected: unspecified , ≤ 2017.011.30188 (custom) Affected: unspecified , ≤ None (custom) |
Date Public
2021-02-09 00:00
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CVE-2021-21021 (GCVE-0-2021-21021)
Vulnerability from cvelistv5 – Published: 2021-02-11 19:42 – Updated: 2024-09-17 03:27
VLAI
EPSS
VEX
Title
Acrobat Reader DC Use-After-Free Vulnerability Could Lead To Arbitrary Code Execution
Summary
Acrobat Reader DC versions versions 2020.013.20074 (and earlier), 2020.001.30018 (and earlier) and 2017.011.30188 (and earlier) are affected by a Use After Free vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Severity
8.8 (High)
CWE
- CWE-416 - Use After Free (CWE-416)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://helpx.adobe.com/security/products/acrobat… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Adobe | Acrobat Reader |
Affected:
unspecified , ≤ 2020.013.20074
(custom)
Affected: unspecified , ≤ 2020.001.30018 (custom) Affected: unspecified , ≤ 2017.011.30188 (custom) Affected: unspecified , ≤ None (custom) |
Date Public
2021-02-09 00:00
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CVE-2021-20292 (GCVE-0-2021-20292)
Vulnerability from cvelistv5 – Published: 2021-05-28 10:42 – Updated: 2024-08-03 17:37
VLAI
EPSS
VEX
Summary
There is a flaw reported in the Linux kernel in versions before 5.9 in drivers/gpu/drm/nouveau/nouveau_sgdma.c in nouveau_sgdma_create_ttm in Nouveau DRM subsystem. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker with a local account with a root privilege, can leverage this vulnerability to escalate privileges and execute code in the context of the kernel.
Severity
No CVSS data available.
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1939686 | x_refsource_MISC |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
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CVE-2021-20232 (GCVE-0-2021-20232)
Vulnerability from cvelistv5 – Published: 2021-03-12 18:25 – Updated: 2025-12-03 15:03
VLAI
EPSS
VEX
Summary
A flaw was found in gnutls. A use after free issue in client_send_params in lib/ext/pre_shared_key.c may lead to memory corruption and other potential consequences.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
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CVE-2021-20231 (GCVE-0-2021-20231)
Vulnerability from cvelistv5 – Published: 2021-03-12 18:23 – Updated: 2024-08-03 17:30
VLAI
EPSS
VEX
Summary
A flaw was found in gnutls. A use after free issue in client sending key_share extension may lead to memory corruption and other consequences.
Severity
No CVSS data available.
CWE
Assigner
References
12 references
| URL | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1922276 | x_refsource_MISC |
| https://www.gnutls.org/security-new.html#GNUTLS-S… | x_refsource_MISC |
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CVE-2021-20227 (GCVE-0-2021-20227)
Vulnerability from cvelistv5 – Published: 2021-03-23 00:00 – Updated: 2024-08-03 17:30
VLAI
EPSS
VEX
Summary
A flaw was found in SQLite's SELECT query functionality (src/select.c). This flaw allows an attacker who is capable of running SQL queries locally on the SQLite database to cause a denial of service or possible code execution by triggering a use-after-free. The highest threat from this vulnerability is to system availability.
Severity
No CVSS data available.
CWE
Assigner
References
8 references
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CVE-2021-20226 (GCVE-0-2021-20226)
Vulnerability from cvelistv5 – Published: 2021-02-23 16:36 – Updated: 2024-08-03 17:30
VLAI
EPSS
VEX
Summary
A use-after-free flaw was found in the io_uring in Linux kernel, where a local attacker with a user privilege could cause a denial of service problem on the system The issue results from the lack of validating the existence of an object prior to performing operations on the object by not incrementing the file reference counter while in use. The highest threat from this vulnerability is to data integrity, confidentiality and system availability.
Severity
No CVSS data available.
CWE
Assigner
References
2 references
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CVE-2021-4192 (GCVE-0-2021-4192)
Vulnerability from cvelistv5 – Published: 2021-12-31 00:00 – Updated: 2024-08-03 17:16
VLAI
EPSS
VEX
Title
Use After Free in vim/vim
Summary
vim is vulnerable to Use After Free
Severity
5.5 (Medium)
CWE
- CWE-416 - Use After Free
Assigner
References
13 references
Impacted products
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CVE-2021-4187 (GCVE-0-2021-4187)
Vulnerability from cvelistv5 – Published: 2021-12-29 17:10 – Updated: 2025-11-03 20:34
VLAI
EPSS
VEX
Title
Use After Free in vim/vim
Summary
vim is vulnerable to Use After Free
Severity
6.8 (Medium)
CWE
- CWE-416 - Use After Free
Assigner
References
13 references
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| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| http://www.openwall.com/lists/oss-security/2022/01/15/1 | mailing-listx_refsource_MLIST |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://support.apple.com/kb/HT213183 | x_refsource_CONFIRM |
| http://seclists.org/fulldisclosure/2022/Mar/29 | mailing-listx_refsource_FULLDISC |
| https://support.apple.com/kb/HT213256 | x_refsource_CONFIRM |
| http://seclists.org/fulldisclosure/2022/May/35 | mailing-listx_refsource_FULLDISC |
| https://support.apple.com/kb/HT213343 | x_refsource_CONFIRM |
| http://seclists.org/fulldisclosure/2022/Jul/14 | mailing-listx_refsource_FULLDISC |
| https://security.gentoo.org/glsa/202208-32 | vendor-advisoryx_refsource_GENTOO |
| https://lists.debian.org/debian-lts-announce/2025… |
Impacted products
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{
"name": "https://support.apple.com/kb/HT213183",
"refsource": "CONFIRM",
"url": "https://support.apple.com/kb/HT213183"
},
{
"name": "20220314 APPLE-SA-2022-03-14-4 macOS Monterey 12.3",
"refsource": "FULLDISC",
"url": "http://seclists.org/fulldisclosure/2022/Mar/29"
},
{
"name": "https://support.apple.com/kb/HT213256",
"refsource": "CONFIRM",
"url": "https://support.apple.com/kb/HT213256"
},
{
"name": "20220516 APPLE-SA-2022-05-16-3 macOS Big Sur 11.6.6",
"refsource": "FULLDISC",
"url": "http://seclists.org/fulldisclosure/2022/May/35"
},
{
"name": "https://support.apple.com/kb/HT213343",
"refsource": "CONFIRM",
"url": "https://support.apple.com/kb/HT213343"
},
{
"name": "20220721 APPLE-SA-2022-07-20-4 Security Update 2022-005 Catalina",
"refsource": "FULLDISC",
"url": "http://seclists.org/fulldisclosure/2022/Jul/14"
},
{
"name": "GLSA-202208-32",
"refsource": "GENTOO",
"url": "https://security.gentoo.org/glsa/202208-32"
}
]
},
"source": {
"advisory": "a8bee03a-6e2e-43bf-bee3-4968c5386a2e",
"discovery": "EXTERNAL"
}
}
}
},
"cveMetadata": {
"assignerOrgId": "c09c270a-b464-47c1-9133-acb35b22c19a",
"assignerShortName": "@huntrdev",
"cveId": "CVE-2021-4187",
"datePublished": "2021-12-29T17:10:09.000Z",
"dateReserved": "2021-12-28T00:00:00.000Z",
"dateUpdated": "2025-11-03T20:34:02.696Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Mitigation
Architecture and Design
Strategy: Language Selection
Choose a language that provides automatic memory management.
Mitigation
Implementation
Strategy: Attack Surface Reduction
When freeing pointers, be sure to set them to NULL once they are freed. However, the utilization of multiple or complex data structures may lower the usefulness of this strategy.
No CAPEC attack patterns related to this CWE.