CVE-2021-4166

Name: CVE-2021-4166
Creator: NVD / NIST
Published: 2021-12-25T19:15:07.28+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 1.59%

Last modified Jun 17, 2026

CVE-2021-4166 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. vim is vulnerable to Out-of-bounds Read. EPSS estimates a 1.59% chance of exploitation in the next 30 days.

Description

vim is vulnerable to Out-of-bounds Read

Metrics

CVSS 3.1

7.1/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H

EPSS Probability

1.59%

72.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Vim	Vim	< 8.2.3884	—
Redhat	Enterprise Linux	8.0	—
Opensuse	Factory	All versions	—
Suse	Linux Enterprise	12.0	—
Suse	Linux Enterprise	15.0	—
Debian	Debian Linux	9.0	—
Debian	Debian Linux	10.0	—
Debian	Debian Linux	11.0	—
Fedoraproject	Fedora	34	—
Fedoraproject	Fedora	35	—
Apple	Mac Os X	10.15.7	—
Apple	Macos	< 12.3	—
Apple	Macos	>= 11.0, < 11.6.6	—
Apple	Macos	10.15.7	Security Update 2022-004

References

http://seclists.org/fulldisclosure/2022/Jul/14Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2022/Mar/29Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2022/May/35Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/01/15/1Mailing List, Third Party Advisory
https://github.com/vim/vim/commit/6f98371532fcff911b462d51bc64f2ce8a6ae682Patch, Third Party Advisory
https://huntr.dev/bounties/229df5dd-5507-44e9-832c-c70364bdf035Exploit, 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/202208-32Third Party Advisory
https://support.apple.com/kb/HT213183Release Notes, Third Party Advisory
https://support.apple.com/kb/HT213256Third Party Advisory
https://support.apple.com/kb/HT213343Third Party Advisory
http://seclists.org/fulldisclosure/2022/Jul/14Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2022/Mar/29Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2022/May/35Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2022/01/15/1Mailing List, Third Party Advisory
https://github.com/vim/vim/commit/6f98371532fcff911b462d51bc64f2ce8a6ae682Patch, Third Party Advisory
https://huntr.dev/bounties/229df5dd-5507-44e9-832c-c70364bdf035Exploit, 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/202208-32Third Party Advisory
https://support.apple.com/kb/HT213183Release Notes, Third Party Advisory
https://support.apple.com/kb/HT213256Third Party Advisory
https://support.apple.com/kb/HT213343Third Party Advisory

Timeline

Published: Dec 25, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-4166?

vim is vulnerable to Out-of-bounds Read

How severe is CVE-2021-4166?

CVE-2021-4166 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 1.59% probability of exploitation in the next 30 days.

How do I fix CVE-2021-4166?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-4166?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST