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Fencer Intel
medium 4.3

CVE-2011-2943 json

The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly va…

published 2011-08-29 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2911

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.6%
EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

The irc_msg_who function in msgs.c in the IRC protocol plugin in libpurple 2.8.0 through 2.9.0 in Pidgin before 2.10.0 does not properly validate characters in nicknames, which allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted nickname that is not properly handled in a WHO response.

Patch / fix

  • pidgin Debian 14, Debian 13, Debian 12 2.10.0-1

debian advisories DEBIAN-CVE-2011-2943

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-2011-2943 updated cvss 4.0

pidgin: Crash in IRC protocol plug-in by listing set of users (/who command) upon session startup

  • Red Hat Enterprise Linux 4 pidgin Red Hat Enterprise Linux 5 pidgin Red Hat Enterprise Linux 6 finch, pidgin, libpurple, pidgin-perl, libpurple-tcl, libpurple-perl
    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

3.60% 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 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

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.