CVE-2021-3903

Name: CVE-2021-3903
Creator: NVD / NIST
Published: 2021-10-27T21:15:08.047+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.60%

Last modified Jun 17, 2026

CVE-2021-3903 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. vim is vulnerable to Heap-based Buffer Overflow. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

Description

vim is vulnerable to Heap-based Buffer Overflow

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.60%

44.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Vim	Vim	< 8.2.3564
Fedoraproject	Fedora	33
Fedoraproject	Fedora	34
Fedoraproject	Fedora	35
Debian	Debian Linux	9.0

References

http://www.openwall.com/lists/oss-security/2022/01/15/1Mailing List, Third Party Advisory
https://github.com/vim/vim/commit/777e7c21b7627be80961848ac560cb0a9978ff43Patch, Third Party Advisory
https://huntr.dev/bounties/35738a4f-55ce-446c-b836-2fb0b39625f8Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/06/msg00014.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BN4EX7BPQU7RP6PXCNCSDORUZBXQ4JUH/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DU26T75PYA3OF7XJGNKMT2ZCQEU4UKP5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FNXY7T5OORA7UJIMGSJBGHFMU6UZWS6P/
http://www.openwall.com/lists/oss-security/2022/01/15/1Mailing List, Third Party Advisory
https://github.com/vim/vim/commit/777e7c21b7627be80961848ac560cb0a9978ff43Patch, Third Party Advisory
https://huntr.dev/bounties/35738a4f-55ce-446c-b836-2fb0b39625f8Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/06/msg00014.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BN4EX7BPQU7RP6PXCNCSDORUZBXQ4JUH/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DU26T75PYA3OF7XJGNKMT2ZCQEU4UKP5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FNXY7T5OORA7UJIMGSJBGHFMU6UZWS6P/

Timeline

Published: Oct 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3903?

vim is vulnerable to Heap-based Buffer Overflow

How severe is CVE-2021-3903?

CVE-2021-3903 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3903?

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-2021-3903?

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

Scan your code now

Source: NVD / NIST