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CVE-2021-4019

26
FAUCET Score

CVE-2021-4019 describes a Heap-based Buffer Overflow vulnerability in Vim, affecting various distributions including Debian and Fedora. This high-severity flaw (CVSS 7.8) can be triggered locally with low attack complexity, potentially leading to high impact on confidentiality, integrity, and availability if a user is tricked into interacting with a malicious file. While the vulnerability has a high FAUCET Risk Score of 58/100, there is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding it.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.7.0CPE matchmatch criteria
cpe:2.3:a:neovim:neovim:*:*:*:*:*:*:*:*
< 8.2.3669CPE 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:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.1HIGH

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.5
Impact Score
4.0
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.79%
Probability of exploitation in next 30 days
EPSS Percentile
76.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0179 is in the 75th percentile among its peer group of 11,616 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: 18943-16820Fixed in: 8.2.3668-3
microsoftpatch availablevia msrc
Product: 18812-16823Fixed in: 8.2.4081-1
microsoftpatch availablevia msrc
Product: cm1 vim 8.2.3668-3 on CBL Mariner 1.0Fixed in: 8.2.3668-3
microsoftpatch availablevia msrc
Product: cbl2 vim 8.2.4081-1 on CBL Mariner 2.0Fixed in: 8.2.4081-1
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: vim-2:8.0.1763-16.el8_5.4
View patch

Vendor Advisories (2)

microsoft2021-Dec/CVE-2021-4019Important

Heap-based Buffer Overflow in vim/vim

Dec 14, 2021
redhatCVE-2021-4019Moderate

vim: heap-based buffer overflow in find_help_tags() in help.c

Nov 23, 2021

References

lists.debian.org / debian-lts-announce/2025/03/msg00023.html
Third Party Advisory
github.com / vim/vim/commit/bd228fd097b41a798f90944b5d1245eddd484142
PatchThird Party Advisory
huntr.dev / bounties/d8798584-a6c9-4619-b18f-001b9a6fca92
ExploitThird Party Advisory
lists.debian.org / debian-lts-announce/2022/03/msg00018.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2022/11/msg00009.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/DRPAI5JVZLI7WHWSBR6NWAPBQAYUQREW
Broken LinkThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/FNXY7T5OORA7UJIMGSJBGHFMU6UZWS6P
Broken LinkThird Party Advisory
security.gentoo.org / glsa/202208-32
Third Party Advisory
openwall.com / lists/oss-security/2022/01/15/1
Mailing ListThird Party Advisory