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CVE-2020-8955

irc_mode_channel_update in plugins/irc/irc-mode.c in WeeChat through 2.7 allows remote attackers...

9.8 CriticalFix available

CVE-2020-8955 is a critical vulnerability (CVSS 9.8) in Weechat, published February 12, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.45%, the 89th percentile. Fixed in weechat 2.7.1-r0.

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).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

3.45%Up 0.6 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 9.8

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).

Record
CVE-2020-8955
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0
7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness
CWE-120
Updated
2026-11-02
CVE List No score

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).

Record
CVE-2020-8955
Updated
2026-11-02
EUVDEUVD-2020-29785 No score

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).

Record
EUVD-2020-29785
Updated
2026-11-03
GitHub AdvisoriesGHSA-j94p-wg5x-c7xg 9.8

irc_mode_channel_update in plugins/irc/irc-mode.c in WeeChat through 2.7 allows remote attackers...

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).

Record
GHSA-j94p-wg5x-c7xg
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-120
Updated
2026-11-02
OSVALPINE-CVE-2020-8955 9.8

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).

Record
ALPINE-CVE-2020-8955
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-03
OSV 9.8

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).

Record
CVE-2020-8955
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
Show 6 moreShow less
OSVDEBIAN-CVE-2020-8955 9.8

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).

Record
DEBIAN-CVE-2020-8955
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2020-8955 9.8

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).

Record
UBUNTU-CVE-2020-8955
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVMGASA-2020-0122 No score

Updated weechat packages fix security vulnerability

Updated weechat packages fix security vulnerability:

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)(CVE-2020-8955).

Record
MGASA-2020-0122
Updated
2026-11-02
OSVopenSUSE-SU-2020:0248-1 No score

Security update for weechat

This update for weechat fixes the following security issue:

  • CVE-2020-8955: Fixed a buffer overflow in plugins/irc/irc-mode.c that allowed attackers to cause a denial of service (bsc#1163889).
Record
openSUSE-SU-2020:0248-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11508-1 No score

weechat-3.2-1.3 on GA media

These are all security issues fixed in the weechat-3.2-1.3 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11508-1
Updated
2026-11-02
OSVUSN-5258-1 No score

weechat vulnerabilities

Stuart Nevans Locke discovered that WeeChat's relay plugin insecurely handled malformed websocket frames. A remote attacker in control of a server could possibly use this issue to cause denial of service in a client. (CVE-2021-40516)

Stuart Nevans Locke discovered that WeeChat insecurely handled certain IRC messages. A remote attacker in control of a server could possibly use this issue to cause denial of service in a client. This issue only affected Ubuntu 16.04 ESM and Ubuntu 18.04 ESM. (CVE-2020-9760)

Stuart Nevans Locke discovered that WeeChat insecurely handled certain IRC messages. A remote unauthenticated attacker could possibly use these issues to cause denial of service in a client. These issues only affected Ubuntu 16.04 ESM and Ubuntu 18.04 ESM. (CVE-2020-9759, CVE-2020-8955)

Joseph Bisch discovered that WeeChat's logger incorrectly handled certain memory operations when handling log file names. A remote attacker could possibly use this issue to cause denial of service in a client. This issue only affected Ubuntu 16.04 ESM. (CVE-2017-14727)

Record
USN-5258-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
weechat
Alpine:v3.11
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.12
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.13
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.14
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.15
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.16
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.17
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.18
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.19
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.20
 0.3.8 up to 2.7.1-r0
2.7.1-r0
Show 17 moreShow less
Affected packages
PackageAffectedFixed
weechat
Alpine:v3.21
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.22
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.23
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Alpine:v3.24
 0.3.8 up to 2.7.1-r0
2.7.1-r0
weechat
Debian:12
 before 2.7.1-1
2.7.1-1
weechat
Debian:13
 before 2.7.1-1
2.7.1-1
weechat
Debian:14
 before 2.7.1-1
2.7.1-1
weechat
Debian:8
 before 1.0.1-1+deb8u3, plus listed versions
1.0.1-11.0.1-1+deb8u11.0.1-1+deb8u1~bpo70+11.0.1-1+deb8u2
1.0.1-1+deb8u3
weechat
Debian:9
 before 1.6-1+deb9u3, plus listed versions
1.6-1+deb9u11.6-1+deb9u2
1.6-1+deb9u3
weechat
Mageia:7
 before 2.4-2.1.mga7
2.4-2.1.mga7
weechat
Ubuntu:Pro:16.04:LTS
 before 1.4-2ubuntu0.1+esm1, plus listed versions
1.3-11.3-1build11.4-11.4-1build11.4-1build21.4-21.4-2ubuntu0.1
1.4-2ubuntu0.1+esm1
weechat
Ubuntu:Pro:18.04:LTS
 before 1.9.1-1ubuntu1+esm1, plus listed versions
1.9.1-11.9.1-1build11.9.1-1ubuntu1
1.9.1-1ubuntu1+esm1
weechat
Ubuntu:Pro:20.04:LTS
 before 2.8-1ubuntu0.1~esm1, plus listed versions
2.6-22.6-2build12.6-2build22.6-2ubuntu12.6-2ubuntu22.8-1
2.8-1ubuntu0.1~esm1
weechat
SUSE:Package Hub 15
 before 2.1-bp151.4.3.1
2.1-bp151.4.3.1
weechat
SUSE:Package Hub 15 SP1
 before 2.1-bp151.4.3.1
2.1-bp151.4.3.1
weechat
openSUSE:Leap 15.1
 before 2.1-bp151.4.3.1
2.1-bp151.4.3.1
weechat
openSUSE:Tumbleweed
 before 3.2-1.3
3.2-1.3

History

History
WhenChangedSources
2026-11-03affected, aliases, referencesOSV
2026-11-03aliasesEUVD
2026-11-02createdCVE List, GitHub Advisories, NVD, OSV

References

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