What’s Vulnerable › Vulnerabilities

CVE-2021-4166: Out-of-bounds Read in vim/vim

• Severity: high (CVSS 7.1 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: 2021-12-25 · updated 2026-10-08
• Weakness: CWE-125

Description

vim is vulnerable to Out-of-bounds Read

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
• Debian Linux: 9.0, 10.0, 11.0
• Fedoraproject Fedora: 34, 35
• openSUSE Factory: all versions
• Red Hat Enterprise Linux: 8.0
• SUSE Linux Enterprise: 12.0, 15.0
• vim/vim: before 8.2.3884 — fixed in 8.2.3884

How to fix

Upgrade to a fixed version: Apple macOS 11.6.6, 12.3; vim/vim 8.2.3884. 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/6f98371532fcff911b462d51bc64f2ce8a6ae682
• https://huntr.dev/bounties/229df5dd-5507-44e9-832c-c70364bdf035
• 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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