What’s Vulnerable › Vulnerabilities

CVE-2021-4187: Use After Free in vim/vim

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-12-29 · updated 2026-06-17
• Weakness: CWE-416

Description

vim is vulnerable to Use After Free

Affected products

• macOS: 10.15.7, 10.15.7-security_update_2020-001, 10.15.7-security_update_2021-001, 10.15.7-security_update_2021-002, 10.15.7-security_update_2021-003, 10.15.7-security_update_2021-004 (+7)
• Apple macOS: before 12.3; from 11.0 before 11.6.6; 10.15.7-security_update_2022-004 — fixed in 11.6.6, 12.3
• Fedoraproject Fedora: 34, 35
• vim/vim: through 8.2.3912

How to fix

Upgrade to a fixed version: Apple macOS 11.6.6, 12.3. 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/4bf1006cae7e87259ccd5219128c3dba75774441
• https://huntr.dev/bounties/a8bee03a-6e2e-43bf-bee3-4968c5386a2e
• 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

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