CVE-2011-2943

Libpurple vulnerability

CVSS

4.3

EPSS

3.6%

EPSS pct

88th

Exploited

No known

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.

Affected vendor

Pidgin

Affected product

Libpurple

CVSS vector

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

Published

2011-08-29

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, medium attack complexity, requiring no authentication. Successful exploitation leads to partial impact to availability.

Its EPSS score of 3.6% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 88% of all scored CVEs.

Check your external exposure to CVE-2011-2943

Confirm whether Pidgin Libpurple is running on any internet-facing host or subdomain.
Match discovered service fingerprints against the version affected by CVE-2011-2943.
Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2011-2943

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