Heap-based Buffer Overflow in vim/vim
Summary
| CVE | CVE-2021-3968 |
|---|---|
| State | PUBLISHED |
| Assigner | @huntrdev |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2021-11-19 12:15:09 UTC |
| Updated | 2026-10-08 22:17:11 UTC |
| Description | vim is vulnerable to Heap-based Buffer Overflow |
Risk And Classification
Primary CVSS: v3.1 8 HIGH from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
EPSS: 0.022310000 probability, percentile 0.822740000 (date 2026-10-11)
Problem Types: CWE-122 | CWE-787 | CWE-122 CWE-122 Heap-based Buffer Overflow
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 8 | HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H |
| 3.0 | [email protected] | Secondary | 8 | HIGH | CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H |
| 3.0 | CNA | DECLARED | 8 | HIGH | CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H |
| 2.0 | [email protected] | Primary | 8.5 | AV:N/AC:M/Au:S/C:C/I:C/A:C |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
RequiredScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CVSS v3.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
RequiredScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
CVSS v2.0 Breakdown
Access Vector
NetworkAccess Complexity
MediumAuthentication
SingleConfidentiality
CompleteIntegrity
CompleteAvailability
CompleteAV:N/AC:M/Au:S/C:C/I:C/A:C
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Fedoraproject | Fedora | 34 | All | All | All |
| Operating System | Fedoraproject | Fedora | 35 | All | All | All |
| Application | Vim | Vim | All | All | All | All |
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| huntr – the Bug Bounty Platform for any GitHub repository | af854a3a-2127-422b-91ae-364da2661108 | huntr.dev | Exploit, Issue Tracking, Patch, Third Party Advisory |
| [SECURITY] Fedora 35 Update: vim-8.2.3642-1.fc35 - package-announce - Fedora Mailing-Lists | af854a3a-2127-422b-91ae-364da2661108 | lists.fedoraproject.org | |
| oss-security - Re: 3 new CVE's in vim | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | Mailing List, Third Party Advisory |
| patch 8.2.3610: crash when ModeChanged triggered too early · vim/vim@a062006 · GitHub | af854a3a-2127-422b-91ae-364da2661108 | github.com | Patch, Third Party Advisory |
| Vim, gVim: Multiple Vulnerabilities (GLSA 202208-32) — Gentoo security | af854a3a-2127-422b-91ae-364da2661108 | security.gentoo.org | Third Party Advisory |
| [SECURITY] Fedora 34 Update: vim-8.2.3755-1.fc34 - package-announce - Fedora Mailing-Lists | af854a3a-2127-422b-91ae-364da2661108 | lists.fedoraproject.org | |
| [SECURITY] Fedora 35 Update: vim-8.2.3642-1.fc35 - package-announce - Fedora Mailing-Lists | MITRE | lists.fedoraproject.org | |
| [SECURITY] Fedora 34 Update: vim-8.2.3755-1.fc34 - package-announce - Fedora Mailing-Lists | MITRE | lists.fedoraproject.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
Legacy QID Mappings
- 282117 Fedora Security Update for vim (FEDORA-2021-b0ac29efb1)
- 282141 Fedora Security Update for vim (FEDORA-2021-5cd9df120e)
- 296061 Oracle Solaris 11.4 Support Repository Update (SRU) 42.113.1 Missing (CPUJAN2022)
- 353078 Amazon Linux Security Advisory for vim : ALAS2-2021-1728
- 353117 Amazon Linux Security Advisory for vim : ALAS-2022-1557
- 353120 Amazon Linux Security Advisory for vim : ALAS2-2022-1743
- 354406 Amazon Linux Security Advisory for vim : ALAS2022-2021-005
- 354497 Amazon Linux Security Advisory for vim : ALAS2022-2022-155
- 354585 Amazon Linux Security Advisory for vim : ALAS-2022-155
- 355135 Amazon Linux Security Advisory for vim : ALAS2023-2023-098
- 500728 Alpine Linux Security Update for vim
- 504502 Alpine Linux Security Update for vim
- 710607 Gentoo Linux Vim, gVim Multiple Vulnerabilities (GLSA 202208-32)
- 752246 SUSE Enterprise Linux Security Update for vim (SUSE-SU-2022:2102-1)
- 753066 SUSE Enterprise Linux Security Update for vim (SUSE-SU-2022:4619-1)
- 900358 Common Base Linux Mariner (CBL-Mariner) Security Update for vim (6233)
- 901665 Common Base Linux Mariner (CBL-Mariner) Security Update for vim (6945-1)