CVE-2020-9760

Name: CVE-2020-9760
Creator: NVD / NIST
Published: 2020-03-23T16:15:17.923+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.19%

Last modified Jun 17, 2026

CVE-2020-9760 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered in WeeChat before 2.7.1 (0.3.4 to 2.7 are affected). When a new IRC message 005 is received with longer nick prefixes, a buffer overflow and possibly a crash can happen when a new mode is set for a nick.. EPSS estimates a 2.19% chance of exploitation in the next 30 days.

Description

An issue was discovered in WeeChat before 2.7.1 (0.3.4 to 2.7 are affected). When a new IRC message 005 is received with longer nick prefixes, a buffer overflow and possibly a crash can happen when a new mode is set for a nick.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

2.19%

80.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Weechat	Weechat	>= 0.3.4, < 2.7.1
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0

References

https://github.com/weechat/weechat/commit/40ccacb4330a64802b1f1e28ed9a6b6d3ca9197fPatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/03/msg00031.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00018.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202003-51Third Party Advisory
https://weechat.org/doc/security/Vendor Advisory
https://github.com/weechat/weechat/commit/40ccacb4330a64802b1f1e28ed9a6b6d3ca9197fPatch, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/03/msg00031.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00018.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202003-51Third Party Advisory
https://weechat.org/doc/security/Vendor Advisory

Timeline

Published: Mar 23, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-9760?

How severe is CVE-2020-9760?

CVE-2020-9760 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.19% probability of exploitation in the next 30 days.

How do I fix CVE-2020-9760?

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-2020-9760?

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

Scan your code now

Source: NVD / NIST