What’s Vulnerable › Vulnerabilities

CVE-2021-4136: Heap-based Buffer Overflow in vim/vim

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-19 · updated 2026-10-08
• Weakness: CWE-122

Description

vim is vulnerable to Heap-based Buffer Overflow

Affected products

• macOS: from 10.15 before 10.15.7; 10.15.7, 10.15.7-security_update_2020, 10.15.7-security_update_2020-001, 10.15.7-security_update_2020-005, 10.15.7-security_update_2020-007, 10.15.7-security_update_2021-001 (+10) — fixed in 10.15.7
• Apple macOS: from 11.0 before 11.6.6; from 12.0 before 12.3 — fixed in 11.6.6, 12.3
• Fedoraproject Fedora: 34, 35
• vim/vim: before 8.2.3847 — fixed in 8.2.3847

How to fix

Upgrade to a fixed version: macOS 10.15.7; Apple macOS 11.6.6, 12.3; vim/vim 8.2.3847. Check the vendor advisory for mitigations.

References

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

Get alerted when CVE-2021-4136 or the next vulnerability affects your stack