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Fencer Intel
critical 9.8

CVE-2020-9760 json

An issue was discovered in WeeChat before 2.7.1 (0.3.4 to 2.7 are affected).

published 6y ago modified 4mo ago also EUVD-2020-30539

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.1%
EPSS 2.1% chance of exploitation in 30 days, percentile 81%
public exploits
0
none known

Summary

An issue was discovered in WeeChat before 2.7.1 (0.3.4 to 2.7 are affected). When a new IRC message 005 is received with longer nick prefixes, a buffer overflow and possibly a crash can happen when a new mode is set for a nick.

Patch / fix

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

debian advisories DEBIAN-CVE-2020-9760

  • 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-2020-9760

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 Arch Linux 2.7.1-1

arch linux advisories AVG-1103

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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-2020-9760 updated cvss 9.8

weechat: receiving IRC message 005 with longer nick prefixes could result in buffer overflow and crash

  • 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

2.10% chance of exploitation in the next 30 days, higher than 81% 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.