CVE-2011-2943

4.3 MEDIUM 4% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited over the network without logging in. Limited direct impact.
Exploit odds: 3.6% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2011-08-29 17:55 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-16 23:32 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 3.6% in the next 30 days (EPSS).
Severity: 4.3 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2011-08-29 17:55 UTC
Last modified: 2026-06-16 23:32 UTC
Exploit probability: 3.6% · EPSS, next 30 days
Record status: Modified

Affected

Pidgin Libpurple 2.8.0
Pidgin Libpurple 2.9.0
Pidgin ≤ 2.9.0
Pidgin 2.0.0
Pidgin 2.0.1
Pidgin 2.0.2
Pidgin 2.1.0
Pidgin 2.1.1

Attack profile CVSS 2.0 · 4.3

Attack vector: Network
Complexity: Medium
Authentication: None
Confidentiality: None
Integrity: None
Availability: Partial

Raw vector

AV:N/AC:M/Au:N/C:N/I:N/A:P

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2011-2943.md and follow it. Check whether this project is affected by CVE-2011-2943. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record