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Fencer Intel
critical 9.8

CVE-2020-8955 json

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 overf…

published 6y ago modified 4mo ago also EUVD-2020-29785

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

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).

Patch / fix

  • weechat Debian 14, Debian 13, Debian 12 2.7.1-1

debian advisories DEBIAN-CVE-2020-8955

  • weechat Ubuntu Pro 16.04 LTS 1.4-2ubuntu0.1+esm1
  • weechat Ubuntu Pro 18.04 LTS 1.9.1-1ubuntu1+esm1

ubuntu advisories UBUNTU-CVE-2020-8955

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • weechat openSUSE Tumbleweed 3.2-1.3
  • weechat Package Hub 15 SP1, Package Hub 15, openSUSE Leap 15.1 2.1-bp151.4.3.1

opensuse advisories openSUSE-SU-2024:11508-1openSUSE-SU-2020:0248-1

  • weechat Alpine 3.24, Alpine 3.23, Alpine 3.22 +11 more 2.7.1-r0

alpine advisories ALPINE-CVE-2020-8955

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • weechat Arch Linux 2.7.1-1

arch linux advisories AVG-1103

Is CVE-2020-8955 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-8955 updated cvss 7.5

weechat: denial of service in irc_mode_channel_update in plugins/irc/irc-mode.c

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.45% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-120 Buffer Copy without Checking Size of Input

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.