CVE-2011-2943

No known exploitation. EPSS puts it in the 89th percentile. A vendor fix is available.

CVSS 2.04.3Medium EPSS percentile89th3.6% chance in 30 days CISA KEVNot listedNo confirmed exploitation
No public exploit known FixVendor fixNo build named by the sources

Published 2011-08-29Updated 2026-04-29Sources: CVE.org, NVD

NVD CVE.org

What to do

The vendor has published a fix. Version details are below where the sources state them.

Check it yourselfA free OpenVAS check exists for this CVE. Run it against your hosts.Is your organisation exposed?Request an assessment to establish which checks fit your systems.

What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS89th

CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

3.6% chance of exploitation activity in the next 30 days, which ranks it in the 89th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

5 events over 5414 days, from the signal feeds we watch.

2026-06-25OpenVAS check added
2026-04-29Patch availablerecord updated
2011-08-29Publishedweakness classified

Affected products

pidginoss-projectaka mxit, libpurple
- libpurpleLibraryLibraryCommunications / messaging-chat
- pidginDesktop AppOn-premCommunications / messaging-chat

And 1 more affected product. See all after sign-in

Technical detail

CVSS 2.0 vector

Open in the CVSS calculator

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

Scored 4.3 by NVD.

How it is reached

Access Vector NetworkExploitable remotely over the network
Access Complexity MediumSome conditions must be met
Authentication NoneNo authentication required

Impact if exploited

Confidentiality NoneNo confidentiality impact
Integrity NoneNo integrity impact
Availability PartialReduced performance or service disruption

Weaknesses

NVD-CWE-OtherNo name in the record

Sources

References in the record

And 9 more references. See all after sign-in

Watch the software you run.

My Stack ranks new CVEs for your products by real-world exploitation, so the next serious one reaches you without reading every advisory.

We'll flag the next CVE, public exploit or patch for Libpurple, not every advisory.

A free account adds

The full version matrix and every affected product
Exploit links, proofs of concept and Metasploit modules
Email alerts for the products you watch
The same data over REST API, MCP and CLI

Create a free account