CVE-2011-2943
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.
Key facts
- CVSS score
- 4.3 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:M/Au:N/C:N/I:N/A:P- EPSS score
- 3.6% (89th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2011-2911)
- Published
- August 29, 2011
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2011-2911 in the EU Vulnerability Database. Last updated in EUVD on August 6, 2024.
View on the EU Vulnerability DatabaseAffected products
- pidgin / libpurple
- pidgin / libpurple
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
- pidgin / pidgin
References
- http://developer.pidgin.im/viewmtn/revision/diff/5749f9193063800d27bef75c2388f6f9cc2f7f37/with/5c2dba4a7e2e76b76e7f472b88953a4316706d43/libpurple/protocols/irc/msgs.c(Patch)
- http://developer.pidgin.im/viewmtn/revision/info/5c2dba4a7e2e76b76e7f472b88953a4316706d43(Patch)
- http://pidgin.im/news/security/?id=53(Patch, Vendor Advisory)
- http://secunia.com/advisories/45663(Vendor Advisory)
- http://secunia.com/advisories/45916
- http://securitytracker.com/id?1025961
- http://www.openwall.com/lists/oss-security/2011/08/20/2
- http://www.openwall.com/lists/oss-security/2011/08/22/2
- http://www.securityfocus.com/bid/49268
- https://bugzilla.redhat.com/show_bug.cgi?id=722939
- https://exchange.xforce.ibmcloud.com/vulnerabilities/69340
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18005
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
Query CVEs from your AI assistant
The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.
Add the CVE brain