CVE-2020-8955

Name: CVE-2020-8955
Creator: NVD / NIST
Published: 2020-02-12T22:15:13.207+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.68%

Last modified Jun 17, 2026

CVE-2020-8955 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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).. EPSS estimates a 3.68% chance of exploitation in the next 30 days.

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).

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

3.68%

88.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Weechat	Weechat	>= 0.3.8, <= 2.7
Fedoraproject	Fedora	30
Fedoraproject	Fedora	31
Fedoraproject	Fedora	32
Opensuse	Backports Sle	15.0
Opensuse	Leap	15.1
Debian	Debian Linux	8.0
Debian	Debian Linux	9.0

References

http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00032.htmlMailing List, Third Party Advisory
https://github.com/weechat/weechat/commit/6f4f147d8e86adf9ad34a8ffd7e7f1f23a7e74daPatch, 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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ASRTCQFFDAAK347URWNDH6NSED2BGNY/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ER23GT23US5JXDLUZAMGMWXKZ74MI4S2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M3LAJTLI3LWZRNCFYJ7PCBBTHUMCCBHH/
https://security.gentoo.org/glsa/202003-51Third Party Advisory
https://weechat.org/doc/security/Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00032.htmlMailing List, Third Party Advisory
https://github.com/weechat/weechat/commit/6f4f147d8e86adf9ad34a8ffd7e7f1f23a7e74daPatch, 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://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ASRTCQFFDAAK347URWNDH6NSED2BGNY/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ER23GT23US5JXDLUZAMGMWXKZ74MI4S2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M3LAJTLI3LWZRNCFYJ7PCBBTHUMCCBHH/
https://security.gentoo.org/glsa/202003-51Third Party Advisory
https://weechat.org/doc/security/Vendor Advisory

Timeline

Published: Feb 12, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8955?

How severe is CVE-2020-8955?

CVE-2020-8955 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.68% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8955?

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-2020-8955?

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

Scan your code now

Source: NVD / NIST