Common Weakness Enumeration
CWE-122
AllowedHeap-based Buffer Overflow
Abstraction: Variant · Status: Draft
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
6336 vulnerabilities reference this CWE, most recent first.
CVE-2021-20043 (GCVE-0-2021-20043)
Vulnerability from cvelistv5 – Published: 2021-12-08 09:55 – Updated: 2024-08-03 17:30
VLAI
EPSS
VEX
Summary
A Heap-based buffer overflow vulnerability in SonicWall SMA100 getBookmarks method allows a remote authenticated attacker to potentially execute code as the nobody user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances.
Severity
No CVSS data available.
CWE
- CWE-122 - Heap-based Buffer Overflow
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://psirt.global.sonicwall.com/vuln-detail/SN… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SonicWall | SonicWall SMA100 |
Affected:
10.2.0.8-37sv and earlier
Affected: 10.2.1.1-19sv and earlier Affected: 10.2.1.2-24sv and earlier |
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CVE-2021-4136 (GCVE-0-2021-4136)
Vulnerability from cvelistv5 – Published: 2021-12-19 17:00 – Updated: 2026-10-08 21:14
VLAI
EPSS
VEX
Title
Heap-based Buffer Overflow in vim/vim
Summary
vim is vulnerable to Heap-based Buffer Overflow
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 21:13 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
References
12 references
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CVE-2021-4019 (GCVE-0-2021-4019)
Vulnerability from cvelistv5 – Published: 2021-12-01 00:00 – Updated: 2025-11-03 20:33
VLAI
EPSS
VEX
Title
Heap-based Buffer Overflow in vim/vim
Summary
vim is vulnerable to Heap-based Buffer Overflow
Severity
7.1 (High)
CWE
- CWE-122 - Heap-based Buffer Overflow
References
9 references
Impacted products
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CVE-2021-3984 (GCVE-0-2021-3984)
Vulnerability from cvelistv5 – Published: 2021-12-01 00:00 – Updated: 2024-08-03 17:09
VLAI
EPSS
VEX
Title
Heap-based Buffer Overflow in vim/vim
Summary
vim is vulnerable to Heap-based Buffer Overflow
Severity
7.3 (High)
CWE
- CWE-122 - Heap-based Buffer Overflow
References
7 references
Impacted products
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CVE-2021-3973 (GCVE-0-2021-3973)
Vulnerability from cvelistv5 – Published: 2021-11-19 11:35 – Updated: 2026-10-08 21:14
VLAI
EPSS
VEX
Title
Heap-based Buffer Overflow in vim/vim
Summary
vim is vulnerable to Heap-based Buffer Overflow
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 21:12 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
References
7 references
| URL | Tags |
|---|---|
| https://huntr.dev/bounties/ce6e8609-77c6-4e17-b9f… | x_refsource_CONFIRM |
| https://github.com/vim/vim/commit/615ddd5342b50a6… | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| 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.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
| https://security.gentoo.org/glsa/202208-32 | vendor-advisoryx_refsource_GENTOO |
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CVE-2021-3968 (GCVE-0-2021-3968)
Vulnerability from cvelistv5 – Published: 2021-11-19 11:40 – Updated: 2026-10-08 21:14
VLAI
EPSS
VEX
Title
Heap-based Buffer Overflow in vim/vim
Summary
vim is vulnerable to Heap-based Buffer Overflow
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 21:13 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
References
6 references
| URL | Tags |
|---|---|
| https://huntr.dev/bounties/00d62924-a7b4-4a61-ba2… | x_refsource_CONFIRM |
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CVE-2021-3966 (GCVE-0-2021-3966)
Vulnerability from cvelistv5 – Published: 2023-01-11 00:00 – Updated: 2025-04-09 18:29
VLAI
EPSS
VEX
Title
Usb bluetooth device ACL read cb buffer overflow
Summary
usb device bluetooth class includes a buffer overflow related to implementation of net_buf_add_mem.
Severity
9.6 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-09 14:00 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow (CWE-122)
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| zephyrproject-rtos | zephyr |
Affected:
unspecified , ≤ v3.0
(custom)
|
Date Public
2022-02-16 00:00
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CVE-2021-3927 (GCVE-0-2021-3927)
Vulnerability from cvelistv5 – Published: 2021-11-05 00:00 – Updated: 2026-10-08 21:03
VLAI
EPSS
VEX
Title
Heap-based Buffer Overflow in vim/vim
Summary
vim is vulnerable to Heap-based Buffer Overflow
Severity
7.3 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 20:53 UTC
CWE
- CWE-122 - Heap-based Buffer Overflow
References
9 references
| URL | Tags |
|---|---|
| https://huntr.dev/bounties/9c2b2c82-48bb-4be9-ab8… | |
| https://github.com/vim/vim/commit/0b5b06cb4777d14… | |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisory |
| http://www.openwall.com/lists/oss-security/2022/01/15/1 | mailing-list |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-list |
| https://security.gentoo.org/glsa/202208-32 | vendor-advisory |
| https://lists.debian.org/debian-lts-announce/2022… | mailing-list |
Impacted products
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CVE-2021-3903 (GCVE-0-2021-3903)
Vulnerability from cvelistv5 – Published: 2021-10-27 21:00 – Updated: 2024-08-03 17:09
VLAI
EPSS
VEX
Title
Heap-based Buffer Overflow in vim/vim
Summary
vim is vulnerable to Heap-based Buffer Overflow
Severity
7.3 (High)
CWE
- CWE-122 - Heap-based Buffer Overflow
References
7 references
| URL | Tags |
|---|---|
| https://huntr.dev/bounties/35738a4f-55ce-446c-b83… | x_refsource_CONFIRM |
| https://github.com/vim/vim/commit/777e7c21b7627be… | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| 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.debian.org/debian-lts-announce/2022… | mailing-listx_refsource_MLIST |
Impacted products
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CVE-2021-3875 (GCVE-0-2021-3875)
Vulnerability from cvelistv5 – Published: 2021-10-15 13:40 – Updated: 2024-08-03 17:09
VLAI
EPSS
VEX
Title
Heap-based Buffer Overflow in vim/vim
Summary
vim is vulnerable to Heap-based Buffer Overflow
Severity
7.8 (High)
CWE
- CWE-122 - Heap-based Buffer Overflow
References
6 references
| URL | Tags |
|---|---|
| https://huntr.dev/bounties/5cdbc168-6ba1-4bc2-ba6… | x_refsource_CONFIRM |
| https://github.com/vim/vim/commit/35a319b77f89774… | x_refsource_MISC |
| https://lists.fedoraproject.org/archives/list/pac… | vendor-advisoryx_refsource_FEDORA |
| 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://security.gentoo.org/glsa/202208-32 | vendor-advisoryx_refsource_GENTOO |
Impacted products
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Mitigation
Pre-design: Use a language or compiler that performs automatic bounds checking.
Mitigation
Architecture and Design
Use an abstraction library to abstract away risky APIs. Not a complete solution.
Mitigation MIT-10
Operation
Build and Compilation
Strategy: Environment Hardening
- Use automatic buffer overflow detection mechanisms that are offered by certain compilers or compiler extensions. Examples include: the Microsoft Visual Studio /GS flag, Fedora/Red Hat FORTIFY_SOURCE GCC flag, StackGuard, and ProPolice, which provide various mechanisms including canary-based detection and range/index checking.
- D3-SFCV (Stack Frame Canary Validation) from D3FEND [REF-1334] discusses canary-based detection in detail.
Mitigation MIT-11
Operation
Build and Compilation
Strategy: Environment Hardening
- Run or compile the software using features or extensions that randomly arrange the positions of a program's executable and libraries in memory. Because this makes the addresses unpredictable, it can prevent an attacker from reliably jumping to exploitable code.
- Examples include Address Space Layout Randomization (ASLR) [REF-58] [REF-60] and Position-Independent Executables (PIE) [REF-64]. Imported modules may be similarly realigned if their default memory addresses conflict with other modules, in a process known as "rebasing" (for Windows) and "prelinking" (for Linux) [REF-1332] using randomly generated addresses. ASLR for libraries cannot be used in conjunction with prelink since it would require relocating the libraries at run-time, defeating the whole purpose of prelinking.
- For more information on these techniques see D3-SAOR (Segment Address Offset Randomization) from D3FEND [REF-1335].
Mitigation
Implementation
Implement and perform bounds checking on input.
Mitigation
Implementation
Strategy: Libraries or Frameworks
Do not use dangerous functions such as gets. Look for their safe equivalent, which checks for the boundary.
Mitigation
Operation
Use OS-level preventative functionality. This is not a complete solution, but it provides some defense in depth.
CAPEC-92: Forced Integer Overflow
This attack forces an integer variable to go out of range. The integer variable is often used as an offset such as size of memory allocation or similarly. The attacker would typically control the value of such variable and try to get it out of range. For instance the integer in question is incremented past the maximum possible value, it may wrap to become a very small, or negative number, therefore providing a very incorrect value which can lead to unexpected behavior. At worst the attacker can execute arbitrary code.