CVE-2011-4601

family_feedbag.c in the oscar protocol plugin in libpurple in Pidgin before 2.10.1 does not perform the expected UTF-8 validation on message data, which allows remote attackers to cause a denial of service (application crash) via a crafted (1) AIM or (2) ICQ message associated with buddy-list addition.

Published: 2011-12-25 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-4601 is rated Moderate Risk (52.6/100): CVSS Medium severity, with high exploitation likelihood (EPSS 4.70%, 91th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2011-4601

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 3.79% 4.70% +0.91%
2 2025-07-15 3.71% 3.79% +0.08%
3 2025-03-30 — 3.71% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-4601

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2011-4601

OS Trackers for CVE-2011-4601

vendor priority summary link
debian low CVE-2011-4601 low priority: Debian including 1 source packages (pidgin), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-4601
redhat medium — https://access.redhat.com/security/cve/CVE-2011-4601
ubuntu low CVE-2011-4601 low priority: Ubuntu including 1 source packages (pidgin), 7 status rows across 7 suites (hardy, lucid, maverick, natty, oneiric, precise, upstream): released 3, ignored 2, needs-triage 1, not-affected 1. https://ubuntu.com/security/CVE-2011-4601

Affected software / configurations for CVE-2011-4601

Vendor Product Version Raw CPE
pidgin pidgin <= 2.10.0 cpe:2.3:a:pidgin:pidgin:*:*:*:*:*:*:*:*
pidgin pidgin 2.0.0 cpe:2.3:a:pidgin:pidgin:2.0.0:*:*:*:*:*:*:*
pidgin pidgin 2.0.1 cpe:2.3:a:pidgin:pidgin:2.0.1:*:*:*:*:*:*:*
pidgin pidgin 2.0.2 cpe:2.3:a:pidgin:pidgin:2.0.2:*:*:*:*:*:*:*
pidgin pidgin 2.1.0 cpe:2.3:a:pidgin:pidgin:2.1.0:*:*:*:*:*:*:*
pidgin pidgin 2.1.1 cpe:2.3:a:pidgin:pidgin:2.1.1:*:*:*:*:*:*:*
pidgin pidgin 2.2.0 cpe:2.3:a:pidgin:pidgin:2.2.0:*:*:*:*:*:*:*
pidgin pidgin 2.2.1 cpe:2.3:a:pidgin:pidgin:2.2.1:*:*:*:*:*:*:*
pidgin pidgin 2.2.2 cpe:2.3:a:pidgin:pidgin:2.2.2:*:*:*:*:*:*:*
pidgin pidgin 2.3.0 cpe:2.3:a:pidgin:pidgin:2.3.0:*:*:*:*:*:*:*
pidgin pidgin 2.3.1 cpe:2.3:a:pidgin:pidgin:2.3.1:*:*:*:*:*:*:*
pidgin pidgin 2.4.0 cpe:2.3:a:pidgin:pidgin:2.4.0:*:*:*:*:*:*:*
pidgin pidgin 2.4.1 cpe:2.3:a:pidgin:pidgin:2.4.1:*:*:*:*:*:*:*
pidgin pidgin 2.4.2 cpe:2.3:a:pidgin:pidgin:2.4.2:*:*:*:*:*:*:*
pidgin pidgin 2.4.3 cpe:2.3:a:pidgin:pidgin:2.4.3:*:*:*:*:*:*:*
pidgin pidgin 2.5.0 cpe:2.3:a:pidgin:pidgin:2.5.0:*:*:*:*:*:*:*
pidgin pidgin 2.5.1 cpe:2.3:a:pidgin:pidgin:2.5.1:*:*:*:*:*:*:*
pidgin pidgin 2.5.2 cpe:2.3:a:pidgin:pidgin:2.5.2:*:*:*:*:*:*:*
pidgin pidgin 2.5.3 cpe:2.3:a:pidgin:pidgin:2.5.3:*:*:*:*:*:*:*
pidgin pidgin 2.5.4 cpe:2.3:a:pidgin:pidgin:2.5.4:*:*:*:*:*:*:*
pidgin pidgin 2.5.5 cpe:2.3:a:pidgin:pidgin:2.5.5:*:*:*:*:*:*:*
pidgin pidgin 2.5.6 cpe:2.3:a:pidgin:pidgin:2.5.6:*:*:*:*:*:*:*
pidgin pidgin 2.5.7 cpe:2.3:a:pidgin:pidgin:2.5.7:*:*:*:*:*:*:*
pidgin pidgin 2.5.8 cpe:2.3:a:pidgin:pidgin:2.5.8:*:*:*:*:*:*:*
pidgin pidgin 2.5.9 cpe:2.3:a:pidgin:pidgin:2.5.9:*:*:*:*:*:*:*
pidgin pidgin 2.6.0 cpe:2.3:a:pidgin:pidgin:2.6.0:*:*:*:*:*:*:*
pidgin pidgin 2.6.1 cpe:2.3:a:pidgin:pidgin:2.6.1:*:*:*:*:*:*:*
pidgin pidgin 2.6.2 cpe:2.3:a:pidgin:pidgin:2.6.2:*:*:*:*:*:*:*
pidgin pidgin 2.6.3 cpe:2.3:a:pidgin:pidgin:2.6.3:*:*:*:*:*:*:*
pidgin pidgin 2.6.4 cpe:2.3:a:pidgin:pidgin:2.6.4:*:*:*:*:*:*:*
pidgin pidgin 2.6.5 cpe:2.3:a:pidgin:pidgin:2.6.5:*:*:*:*:*:*:*
pidgin pidgin 2.6.6 cpe:2.3:a:pidgin:pidgin:2.6.6:*:*:*:*:*:*:*
pidgin pidgin 2.7.1 cpe:2.3:a:pidgin:pidgin:2.7.1:*:*:*:*:*:*:*
pidgin pidgin 2.7.2 cpe:2.3:a:pidgin:pidgin:2.7.2:*:*:*:*:*:*:*
pidgin pidgin 2.7.3 cpe:2.3:a:pidgin:pidgin:2.7.3:*:*:*:*:*:*:*
pidgin pidgin 2.7.4 cpe:2.3:a:pidgin:pidgin:2.7.4:*:*:*:*:*:*:*
pidgin pidgin 2.7.5 cpe:2.3:a:pidgin:pidgin:2.7.5:*:*:*:*:*:*:*
pidgin pidgin 2.7.6 cpe:2.3:a:pidgin:pidgin:2.7.6:*:*:*:*:*:*:*
pidgin pidgin 2.7.7 cpe:2.3:a:pidgin:pidgin:2.7.7:*:*:*:*:*:*:*
pidgin pidgin 2.7.8 cpe:2.3:a:pidgin:pidgin:2.7.8:*:*:*:*:*:*:*
pidgin pidgin 2.7.9 cpe:2.3:a:pidgin:pidgin:2.7.9:*:*:*:*:*:*:*
pidgin pidgin 2.7.10 cpe:2.3:a:pidgin:pidgin:2.7.10:*:*:*:*:*:*:*
pidgin pidgin 2.7.11 cpe:2.3:a:pidgin:pidgin:2.7.11:*:*:*:*:*:*:*
pidgin pidgin 2.8.0 cpe:2.3:a:pidgin:pidgin:2.8.0:*:*:*:*:*:*:*
pidgin pidgin 2.9.0 cpe:2.3:a:pidgin:pidgin:2.9.0:*:*:*:*:*:*:*

References for CVE-2011-4601

URL Tags
http://developer.pidgin.im/viewmtn/revision/diff/bc79b1bf09dcfa1d8edac86a06761fce7416e69c/with/757272a78a8ca6027d518e614712c3399e34dda3/libpurple/protocols/oscar/family_feedbag.c
http://developer.pidgin.im/viewmtn/revision/info/757272a78a8ca6027d518e614712c3399e34dda3
http://pidgin.im/news/security/?id=57 Vendor Advisory
http://secunia.com/advisories/47219
http://secunia.com/advisories/47234
http://www.mandriva.com/security/advisories?name=MDVSA-2011:183
http://www.openwall.com/lists/oss-security/2011/12/10/1
http://www.openwall.com/lists/oss-security/2011/12/10/2
http://www.redhat.com/support/errata/RHSA-2011-1820.html
http://www.redhat.com/support/errata/RHSA-2011-1821.html
http://www.securityfocus.com/bid/51010
https://hermes.opensuse.org/messages/13195955
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18408
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