CVE-2016-4414: The onReadyRead function in core/coreauthhandler.cpp in Quassel before 0.12.4 allows remote attackers to cause

Q: How do I fix CVE-2016-4414?

leap: mitigate or apply the listed mitigation; opensuse: mitigate or apply the listed mitigation; quassel: upgrade to newer than 0.12.3. Exact commands for each OS are on this page.

Q: Is CVE-2016-4414 being exploited?

CVE-2016-4414 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-2016-4414 affect?

CVE-2016-4414 affects leap, opensuse, quassel. Severity is high (CVSS 7.5). The onReadyRead function in core/coreauthhandler.cpp in Quassel before 0.12.4 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via invalid handshake data.

Q: How urgent is CVE-2016-4414?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEMITIGATEMITIGATEUPGRADE

CVE-2016-4414 is a high-severity flaw (CVSS 7.5) affecting leap, opensuse, quassel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The onReadyRead function in core/coreauthhandler.cpp in Quassel before 0.12.4 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via invalid handshake data.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Published	2016-06-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fedoraproject · opensuse · quassel-irc

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

Am I affected?

Timeline

2016-06-13 19:59 UTCPublished CVE record published
2026-06-17 00:47 UTCUpdated Record last modified

opensuse leap MITIGATE

Affected: 42.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 42.1

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.

opensuse opensuse MITIGATE

Affected: 13.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 13.2

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.

quassel-irc quassel UPGRADE

Affected: <= 0.12.3

Fixed in: newer than 0.12.3

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 0.12.3 (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.

fedoraproject fedora MITIGATE

Affected: 22 · 23 · 24

Fixed in: no fixed release known

Safe to downgrade to: a release before 22

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-2016-4414?

leap: mitigate or apply the listed mitigation; opensuse: mitigate or apply the listed mitigation; quassel: upgrade to newer than 0.12.3. Exact commands for each OS are on this page.

Is CVE-2016-4414 being exploited?

CVE-2016-4414 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-2016-4414 affect?

CVE-2016-4414 affects leap, opensuse, quassel. Severity is high (CVSS 7.5). The onReadyRead function in core/coreauthhandler.cpp in Quassel before 0.12.4 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via invalid handshake data.

How urgent is CVE-2016-4414?

Priority 53/100. High severity; Remotely exploitable, no login, no user action

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References

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