# CVE-2020-8955: weechat: irc_mode_channel_update in plugins/irc/irc-mode.c in WeeChat through 2.7 allows remote attackers to cause a denial of...

CVE-2020-8955 is fixed in 4 products on 1 platform, first by weechat 1.9.1-1ubuntu1+esm1, released September 5, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-8955
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0345
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 12, 2020

## 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).

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | weechat Ubuntu 18.04.6 LTS (bionic) | 1.9.1-1ubuntu1+esm1 | [weechat 1.9.1-1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-weechat-1.9.1-1ubuntu1-esm1.md) | Sep 5, 2021 |
| Linux | weechat-core Ubuntu 18.04.6 LTS (bionic) | 1.9.1-1ubuntu1+esm1 | [weechat-core 1.9.1-1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-weechat-core-1.9.1-1ubuntu1-esm1.md) | Sep 5, 2021 |
| Linux | weechat-curses Ubuntu 18.04.6 LTS (bionic) | 1.9.1-1ubuntu1+esm1 | [weechat-curses 1.9.1-1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-weechat-curses-1.9.1-1ubuntu1-esm1.md) | Sep 5, 2021 |
| Linux | weechat-plugins Ubuntu 18.04.6 LTS (bionic) | 1.9.1-1ubuntu1+esm1 | [weechat-plugins 1.9.1-1ubuntu1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-weechat-plugins-1.9.1-1ubuntu1-esm1.md) | Sep 5, 2021 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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