CVE-2015-3427: Quassel before 0.12.2 does not properly re-initialize the database session when the PostgreSQL database is res

Q: How do I fix CVE-2015-3427?

quassel: upgrade to newer than 0.12.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2015-3427 being exploited?

CVE-2015-3427 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-2015-3427 affect?

CVE-2015-3427 affects quassel, debian linux. Severity is high (CVSS 7.5). Quassel before 0.12.2 does not properly re-initialize the database session when the PostgreSQL database is restarted, which allows remote attackers to conduct SQL injection attacks via a \ (backslash) in a message. NOTE: this vulnerability

Q: How urgent is CVE-2015-3427?

Priority 51/100. High severity; On your watchlist

This month

HIGH 7.5WATCHLISTUPGRADEMITIGATE

CVE-2015-3427 is a high-severity flaw (CVSS 7.5) affecting quassel, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Quassel before 0.12.2 does not properly re-initialize the database session when the PostgreSQL database is restarted, which allows remote attackers to conduct SQL injection attacks via a \ (backslash) in a message. NOTE: this vulnerability exists because of an incomplete fix for CVE-2013-4422.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.0% (top 19%)
CISA exploited list	No
Weakness	CWE-89
Published	2015-05-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · quassel-irc

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-05-14 14:59 UTCPublished CVE record published
2026-06-17 00:25 UTCUpdated Record last modified

quassel-irc quassel UPGRADE

Affected: <= 0.12.1

Fixed in: newer than 0.12.1

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 0.12.1 (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.

debian debian linux MITIGATE

Affected: 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

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-2015-3427?

quassel: upgrade to newer than 0.12.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-3427 being exploited?

CVE-2015-3427 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-2015-3427 affect?

CVE-2015-3427 affects quassel, debian linux. Severity is high (CVSS 7.5). Quassel before 0.12.2 does not properly re-initialize the database session when the PostgreSQL database is restarted, which allows remote attackers to conduct SQL injection attacks via a \ (backslash) in a message. NOTE: this vulnerability

How urgent is CVE-2015-3427?

Priority 51/100. High severity; On your watchlist

Software pages

PostgreSQL vulnerabilities · Debian vulnerabilities

Related CVEs

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CVE-2018-1000178 CRITICAL 9.8 DOWNGRADE MITIGATE A heap corruption of type CWE-120 exists in quassel version 0.12.4 in quasselcore in void DataStreamPeer::proc
CVE-2016-4414 HIGH 7.5 MITIGATE MITIGATE The onReadyRead function in core/coreauthhandler.cpp in Quassel before 0.12.4 allows remote attackers to cause
CVE-2015-8547 HIGH 7.5 UPGRADE MITIGATE The CoreUserInputHandler::doMode function in core/coreuserinputhandler.cpp in Quassel 0.10.0 allows remote att

References

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