Vulnerability · Published Oct 19, 2021 · Assigned by @huntrdev

CVE-2021-3872Heap-based Buffer Overflow in vim/vim

High 7.8

In plain English

A high-severity heap buffer overflow in vim/vim from vim. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.5% (higher than 74% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.0)7.8High

Exploit odds (30 days)1.5%top 25.7% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

vim is vulnerable to Heap-based Buffer Overflow

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
AlmaLinux:8	vim-X11	2:8.0.1763-16.el8_5.13	ALSA-2022:0366
AlmaLinux:8	vim-common	2:8.0.1763-16.el8_5.13	ALSA-2022:0366
AlmaLinux:8	vim-enhanced	2:8.0.1763-16.el8_5.13	ALSA-2022:0366
AlmaLinux:8	vim-filesystem	2:8.0.1763-16.el8_5.13	ALSA-2022:0366
AlmaLinux:8	vim-minimal	2:8.0.1763-16.el8_5.13	ALSA-2022:0366
Debian:12	vim	2:8.2.3565-1	DEBIAN-CVE-2021-3872
Debian:13	vim	2:8.2.3565-1	DEBIAN-CVE-2021-3872
Debian:14	vim	2:8.2.3565-1	DEBIAN-CVE-2021-3872
Rocky Linux:8	vim	2:8.0.1763-16.el8_5.4	RLSA-2022:0366
Ubuntu:22.04:LTS	vim	2:8.2.3565-1ubuntu2	UBUNTU-CVE-2021-3872

Affected products (as reported)

Vendor	Product	Versions
vim	vim/vim	unspecified – before 8.2.3487

Weakness: CWE-122 · Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

https://huntr.dev/bounties/c958013b-1c09-4939-92ca-92f50aa169e8 x_refsource_CONFIRM
https://github.com/vim/vim/commit/826bfe4bbd7594188e3d74d2539d9707b1c6a14b x_refsource_MISC
FEDORA-2021-84f4cf3244 vendor-advisory, x_refsource_FEDORA
FEDORA-2021-6988830606 vendor-advisory, x_refsource_FEDORA
[debian-lts-announce] 20220311 [SECURITY] [DLA 2947-1] vim security update mailing-list, x_refsource_MLIST
GLSA-202208-32 vendor-advisory, x_refsource_GENTOO
https://lists.debian.org/debian-lts-announce/2025/03/msg00023.html