CVE-2010-3443: ctcphandler.cpp in Quassel before 0.6.3 and 0.7.x before 0.7.1 allows remote attackers to cause a denial of se

Q: How do I fix CVE-2010-3443?

quassel irc: upgrade to newer than 0.6.2; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2010-3443 being exploited?

CVE-2010-3443 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-2010-3443 affect?

CVE-2010-3443 affects quassel irc, ubuntu linux. Severity is medium (CVSS 5.0). ctcphandler.cpp in Quassel before 0.6.3 and 0.7.x before 0.7.1 allows remote attackers to cause a denial of service (unresponsive IRC) via multiple Client-To-Client Protocol (CTCP) requests in a PRIVMSG message.

Q: How urgent is CVE-2010-3443?

Priority 43/100. On your watchlist

This month

MEDIUM 5.0WATCHLISTUPGRADEMITIGATE

CVE-2010-3443 is a medium-severity flaw (CVSS 5.0) affecting quassel irc, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ctcphandler.cpp in Quassel before 0.6.3 and 0.7.x before 0.7.1 allows remote attackers to cause a denial of service (unresponsive IRC) via multiple Client-To-Client Protocol (CTCP) requests in a PRIVMSG message.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-399
Published	2013-11-23
Last modified	2026-06-16

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

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

Am I affected?

Timeline

2013-11-23 11:55 UTCPublished CVE record published
2026-06-16 23:22 UTCUpdated Record last modified

quassel-irc quassel irc UPGRADE

Affected: <= 0.6.2 · 0.1.0 · 0.3.0 · 0.3.0.1 · 0.3.0.2 · 0.3.0.3 · 0.3.1 · 0.4.0

Fixed in: newer than 0.6.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 0.6.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade quassel-irc

Note

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

canonical ubuntu linux MITIGATE

Affected: 9.04 · 9.10 · 10.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2010-3443?

quassel irc: upgrade to newer than 0.6.2; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2010-3443 being exploited?

CVE-2010-3443 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-2010-3443 affect?

CVE-2010-3443 affects quassel irc, ubuntu linux. Severity is medium (CVSS 5.0). ctcphandler.cpp in Quassel before 0.6.3 and 0.7.x before 0.7.1 allows remote attackers to cause a denial of service (unresponsive IRC) via multiple Client-To-Client Protocol (CTCP) requests in a PRIVMSG message.

How urgent is CVE-2010-3443?

Priority 43/100. On your watchlist

Software pages

Ubuntu vulnerabilities

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References

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