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CVE-2021-4136

26
FAUCET Score

CVE-2021-4136 is a high-severity heap-based buffer overflow vulnerability affecting Vim, as well as products from Apple and Fedora Project. This flaw could lead to high impact on confidentiality, integrity, and availability if exploited. The attack requires local access and user interaction, but has low attack complexity. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 8.2.3847CPE matchmatch criteria
cpe:2.3:a:vim:vim:*:*:*:*:*:*:*:*
34CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
35CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
>= 10.15, < 10.15.7CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
10.15.7CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.15.7:-:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.3HIGH

CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:L

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
LOW
Exploitability Score
1.8
Impact Score
5.5
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.83%
Probability of exploitation in next 30 days
EPSS Percentile
76.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0183 is in the 75th percentile among its peer group of 11,621 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

github_advisorypatch availablevia nvd_reference
View patch
microsoftpatch availablevia msrc
Product: 18933-16820Fixed in: 8.2.3668-4
microsoftpatch availablevia msrc
Product: 18812-16823Fixed in: 8.2.4081-1
microsoftpatch availablevia msrc
Product: cm1 vim 8.2.3668-4 on CBL Mariner 1.0Fixed in: 8.2.3668-4
microsoftpatch availablevia msrc
Product: cbl2 vim 8.2.4081-1 on CBL Mariner 2.0Fixed in: 8.2.4081-1
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux 9Fixed in: vim

Vendor Advisories (2)

redhatCVE-2021-4136Low

vim: heap-based buffer overflow in eval_lambda() in src/eval.c

Dec 19, 2021
microsoft2021-Dec/CVE-2021-4136Important

Heap-based Buffer Overflow in vim/vim

Dec 14, 2021

References

seclists.org / fulldisclosure/2022/Jul/14
Mailing ListThird Party Advisory
seclists.org / fulldisclosure/2022/Mar/29
Mailing ListThird Party Advisory
seclists.org / fulldisclosure/2022/May/35
Mailing ListThird Party Advisory
github.com / vim/vim/commit/605ec91e5a7330d61be313637e495fa02a6dc264
PatchThird Party Advisory
huntr.dev / bounties/5c6b93c1-2d27-4e98-a931-147877b8c938
ExploitPatchThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/2EY2VFBU3YGGWI5BW4XKT3F37MYGEQUD
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/3FH2J57GDA2WMBS6J56F6QQRA6BXQQFZ
security.gentoo.org / glsa/202208-32
Third Party Advisory
support.apple.com / kb/HT213183
Release NotesThird Party Advisory
support.apple.com / kb/HT213256
Third Party Advisory
support.apple.com / kb/HT213343
Third Party Advisory
openwall.com / lists/oss-security/2022/01/15/1
Mailing ListThird Party Advisory