What’s Vulnerable › Vulnerabilities

CVE-2020-9760

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-03-23 · updated 2026-06-17
• Weakness: CWE-120

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.

Affected products

• Debian Linux: 8.0, 9.0
• weechat: from 0.3.4 before 2.7.1 — fixed in 2.7.1

How to fix

Upgrade to a fixed version: weechat 2.7.1. Check the vendor advisory for mitigations.

References

• https://github.com/weechat/weechat/commit/40ccacb4330a64802b1f1e28ed9a6b6d3ca9197f
• https://lists.debian.org/debian-lts-announce/2020/03/msg00031.html
• https://lists.debian.org/debian-lts-announce/2021/09/msg00018.html
• https://security.gentoo.org/glsa/202003-51
• https://weechat.org/doc/security/
• https://github.com/weechat/weechat/commit/40ccacb4330a64802b1f1e28ed9a6b6d3ca9197f
• https://lists.debian.org/debian-lts-announce/2020/03/msg00031.html
• https://lists.debian.org/debian-lts-announce/2021/09/msg00018.html
• https://security.gentoo.org/glsa/202003-51
• https://weechat.org/doc/security/

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