Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-4166

CVE-2021-4166HIGH

vim vim/vim — Out-of-bounds Read in vim/vim

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   N   R  U  H  N  H    7.1   .0170   76.8     —

AFFECTED
  Product  Versions       Fixed
  vim/vim  unspecified –  —

TIMELINE
  Dec 24  Reserved by @huntrdev
  Dec 25  Published (CNA: @huntrdev)
  Oct 8   EXPLOIT PUBLISHED — CVE-2021-4166 (vim/vim). Public exploit reference added.

CWE-125 · CNA: @huntrdev · CVSS v3.1 · 12 references · NVD status: Modified

Description

vim is vulnerable to Out-of-bounds Read

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
December 24, 2021	Reserved	Reserved by @huntrdev
December 25, 2021	Published	Published (CNA: @huntrdev)
October 8, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2021-4166 (vim/vim). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
vim	vim/vim	—	unspecified	—

Weaknesses

CWE-125

References (12)

http://seclists.org/fulldisclosure/2022/Jul/14 [Mailing List, Third Party Advisory]
http://seclists.org/fulldisclosure/2022/Mar/29 [Mailing List, Third Party Advisory]
http://seclists.org/fulldisclosure/2022/May/35 [Mailing List, Third Party Advisory]
http://www.openwall.com/lists/oss-security/2022/01/15/1 [Mailing List, Third Party Advisory]
https://github.com/vim/vim/commit/6f98371532fcff911b462d51bc64f2ce8a6ae682 [Patch, Third Party Advisory]
https://huntr.dev/bounties/229df5dd-5507-44e9-832c-c70364bdf035 [Exploit, Issue Tracking, Patch, Third Party Advisory]
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 [Third Party Advisory]
https://support.apple.com/kb/HT213183 [Release Notes, Third Party Advisory]
https://support.apple.com/kb/HT213256 [Third Party Advisory]
https://support.apple.com/kb/HT213343 [Third Party Advisory]

Authoritative record: CVE-2021-4166 at cve.org

Vendors: vim

Weaknesses: CWE-125

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-4166 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.