CVE-2011-3354

The CtcpParser::packedReply method in core/ctcpparser.cpp in Quassel before 0.7.3 allows remote attackers to cause a denial of service (crash) via a crafted Client-To-Client Protocol (CTCP) request, as demonstrated in the wild in September 2011.

Published: 2011-10-04 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-3354 is rated Moderate Risk (48.1/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.07%). 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-2011-3354

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 1.62% 2.07% +0.45%
2 2025-03-30 2.02% 1.62% -0.40%
3 2025-03-29 — 2.02% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-3354

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-2011-3354

OS Trackers for CVE-2011-3354

vendor priority summary link
debian low CVE-2011-3354 low priority: Debian including 1 source packages (quassel), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2011-3354
ubuntu medium CVE-2011-3354 medium priority: Ubuntu including 1 source packages (quassel), 5 status rows across 5 suites (hardy, lucid, maverick, natty, upstream): released 4, DNE 1. https://ubuntu.com/security/CVE-2011-3354

Affected software / configurations for CVE-2011-3354

Vendor Product Version Raw CPE
quassel-irc quassel <= 0.7.2 cpe:2.3:a:quassel-irc:quassel:*:*:*:*:*:*:*:*
quassel-irc quassel 0.3.0 cpe:2.3:a:quassel-irc:quassel:0.3.0:*:*:*:*:*:*:*
quassel-irc quassel 0.3.1 cpe:2.3:a:quassel-irc:quassel:0.3.1:*:*:*:*:*:*:*
quassel-irc quassel 0.4.0 cpe:2.3:a:quassel-irc:quassel:0.4.0:*:*:*:*:*:*:*
quassel-irc quassel 0.4.1 cpe:2.3:a:quassel-irc:quassel:0.4.1:*:*:*:*:*:*:*
quassel-irc quassel 0.4.2 cpe:2.3:a:quassel-irc:quassel:0.4.2:*:*:*:*:*:*:*
quassel-irc quassel 0.4.3 cpe:2.3:a:quassel-irc:quassel:0.4.3:*:*:*:*:*:*:*
quassel-irc quassel 0.5.0 cpe:2.3:a:quassel-irc:quassel:0.5.0:*:*:*:*:*:*:*
quassel-irc quassel 0.5.1 cpe:2.3:a:quassel-irc:quassel:0.5.1:*:*:*:*:*:*:*
quassel-irc quassel 0.5.2 cpe:2.3:a:quassel-irc:quassel:0.5.2:*:*:*:*:*:*:*
quassel-irc quassel 0.6.0 cpe:2.3:a:quassel-irc:quassel:0.6.0:*:*:*:*:*:*:*
quassel-irc quassel 0.6.1 cpe:2.3:a:quassel-irc:quassel:0.6.1:*:*:*:*:*:*:*
quassel-irc quassel 0.7.0 cpe:2.3:a:quassel-irc:quassel:0.7.0:*:*:*:*:*:*:*
quassel-irc quassel 0.7.1 cpe:2.3:a:quassel-irc:quassel:0.7.1:*:*:*:*:*:*:*

References for CVE-2011-3354

cvelogic Threat Intelligence