CVE-2011-3354: The CtcpParser::packedReply method in core/ctcpparser.cpp in Quassel before 0.7.3 allows remote attackers to c

Q: How do I fix CVE-2011-3354?

quassel: upgrade to newer than 0.7.2. Exact commands for each OS are on this page.

Q: Is CVE-2011-3354 being exploited?

CVE-2011-3354 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2011-3354 affect?

CVE-2011-3354 affects quassel. Severity is medium (CVSS 5.0). 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

Q: How urgent is CVE-2011-3354?

Priority 38/100. No elevated risk signals yet.

Routine

MEDIUM 5.0UPGRADE

CVE-2011-3354 is a medium-severity flaw (CVSS 5.0) affecting quassel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-399
Published	2011-10-04
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: quassel-irc

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2011-10-04 10:55 UTCPublished CVE record published
2026-06-16 23:33 UTCUpdated Record last modified

quassel-irc quassel UPGRADE

Affected: <= 0.7.2 · 0.3.0 · 0.3.1 · 0.4.0 · 0.4.1 · 0.4.2 · 0.4.3 · 0.5.0

Fixed in: newer than 0.7.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy quassel || rpm -q quassel || quassel --version

2. UPGRADE to newer than 0.7.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade quassel

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade quassel

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2011-3354?

quassel: upgrade to newer than 0.7.2. Exact commands for each OS are on this page.

Is CVE-2011-3354 being exploited?

CVE-2011-3354 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2011-3354 affect?

CVE-2011-3354 affects quassel. Severity is medium (CVSS 5.0). 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

How urgent is CVE-2011-3354?

Priority 38/100. No elevated risk signals yet.

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References

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