pidgin: Crash in IRC protocol plug-in by listing set of users (/who command) upon session startup
Published Aug 29, 2011
4.3
MEDIUMCVSS 2.0
EPSS 3.60%
Description
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 products
No data.
- 2.8.0
- 2.9.0
- ≤ 2.9.0
- 2.0.0
- 2.0.1
- 2.0.2
- 2.1.0
- 2.1.1
- 2.2.0
- 2.2.1
- 2.2.2
- 2.3.0
- 2.3.1
- 2.4.0
- 2.4.1
- 2.4.2
- 2.4.3
- 2.5.0
- 2.5.1
- 2.5.2
- 2.5.3
- 2.5.4
- 2.5.5
- 2.5.6
- 2.5.7
- 2.5.8
- 2.5.9
- 2.6.0
- 2.6.1
- 2.6.2
- 2.6.4
- 2.6.5
- 2.6.6
- 2.7.0
- 2.7.1
- 2.7.2
- 2.7.3
- 2.7.4
- 2.7.5
- 2.7.6
- 2.7.7
- 2.7.8
- 2.7.9
- 2.7.10
- 2.7.11
- 2.8.0
No data.
Red Hat Enterprise Linux 4
pidgin
Not affected
Red Hat Enterprise Linux 5
pidgin
Not affected
Red Hat Enterprise Linux 6
pidgin
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | pidgin | Not affected | n/a |
| Red Hat Enterprise Linux 5 | pidgin | Not affected | n/a |
| Red Hat Enterprise Linux 6 | pidgin | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of pidgin as shipped with Red Hat Enterprise Linux 4, 5, or 6 as they contained a version of pidgin that did not support /who IRC protocol command.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:M/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 3.60% (0.03596) | 89.08th | v5 (v2026.06.15) |
| Jun 15, 2026 | 3.60% (0.03596) | 87.92th | v5 (v2026.06.15) |
| Mar 30, 2025 | 3.96% (0.03955) | 87.28th | v4 (v2025.03.14) |
| Mar 29, 2025 | 8.82% (0.08815) | 87.34th | v4 (v2025.03.14) |
| Mar 19, 2025 | 3.96% (0.03955) | 86.98th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.31% (0.02306) | 83.62th | v4 (v2025.03.14) |
| Dec 17, 2024 | 7.38% (0.07375) | 94.04th | v3 (v2023.03.01) |
| Mar 7, 2023 | 10.99% (0.10994) | 94.17th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.17% (0.02172) | 80.77th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.17% (0.02172) | 78.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.17% (0.02172) | 57.73th | v2 (v2022.01.01) |
No CWE recorded.
References (15)
- http://developer.pidgin.im/viewmtn/revision/diff/5749f9193063800d27bef75c2388f6f9cc2f7f37/with/5c2dba4a7e2e76b76e7f472b88953a4316706d43/libpurple/protocols/irc/msgs.c x_refsource_CONFIRMPatch
- http://developer.pidgin.im/viewmtn/revision/info/5c2dba4a7e2e76b76e7f472b88953a4316706d43 x_refsource_CONFIRMPatch
- http://pidgin.im/news/security/?id=53 x_refsource_CONFIRMPatchVendor Advisory
- http://secunia.com/advisories/45663 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://secunia.com/advisories/45916 third-party-advisoryx_refsource_SECUNIA
- http://securitytracker.com/id?1025961 vdb-entryx_refsource_SECTRACK
- http://www.openwall.com/lists/oss-security/2011/08/20/2 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2011/08/22/2 mailing-listx_refsource_MLIST
- http://www.securityfocus.com/bid/49268 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2011-2943 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=722939 x_refsource_CONFIRMIssue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/69340 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2011-2943
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18005 vdb-entrysignaturex_refsource_OVAL
- https://www.cve.org/CVERecord?id=CVE-2011-2943
Change history (0)
No recorded changes yet.