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Vulnerability record · CVE-2020-8955 · published 12 February 2020

CVE-2020-8955: Weechat classic buffer overflow vulnerability

Weechat · Weechat

irc_mode_channel_update in plugins/irc/irc-mode.c in WeeChat through 2.7 allows remote attackers to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a malformed IRC message 324 (channel mode).

9.8 CVSS 3.1 Critical EPSS 3.7% · top 10.5% CWE-120 · Classic buffer overflow
9.8CVSS 3.1 base score, v2 7.5
3.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
18References
17 Jun 2026Last modified by NVD

Description

irc_mode_channel_update in plugins/irc/irc-mode.c in WeeChat through 2.7 allows remote attackers to cause a denial of service (buffer overflow and application crash) or possibly have unspecified other impact via a malformed IRC message 324 (channel mode).

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

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00032.html Mailing ListThird Party Advisory
https://github.com/weechat/weechat/commit/6f4f147d8e86adf9ad34a8ffd7e7f1f23a7e74da PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/03/msg00031.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00018.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ASRTCQFFDAAK347URWNDH6
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ER23GT23US5JXDLUZAMGMWX
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M3LAJTLI3LWZRNCFYJ7PCBB
https://security.gentoo.org/glsa/202003-51 Third Party Advisory
https://weechat.org/doc/security/ Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00032.html Mailing ListThird Party Advisory
https://github.com/weechat/weechat/commit/6f4f147d8e86adf9ad34a8ffd7e7f1f23a7e74da PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/03/msg00031.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00018.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ASRTCQFFDAAK347URWNDH6
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ER23GT23US5JXDLUZAMGMWX
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M3LAJTLI3LWZRNCFYJ7PCBB
https://security.gentoo.org/glsa/202003-51 Third Party Advisory
https://weechat.org/doc/security/ Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-8955), CISA KEV, FIRST EPSS (scores of 2026-10-16). This page is refreshed as NVD updates the record.