CVE-2011-4603

The silc_channel_message function in ops.c in the SILC 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 message, a different vulnerability than CVE-2011-3594.

Published: 2011-12-17 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-4603 is rated Moderate Risk (44.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.17%). Review affected assets and schedule 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-2011-4603

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 2025-03-30 3.07% 1.17% -1.91%
2 2025-03-29 1.17% 3.07% +1.91%
3 2025-03-19 — 1.17% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-4603

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-2011-4603

OS Trackers for CVE-2011-4603

vendor priority summary link
debian low CVE-2011-4603 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-2011-4603
redhat medium — https://access.redhat.com/security/cve/CVE-2011-4603
ubuntu low CVE-2011-4603 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-2011-4603

Affected software / configurations for CVE-2011-4603

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-2011-4603

cvelogic Threat Intelligence