CVE-2003-0363: Format string vulnerability in LICQ 1.2.6, 1.0.3 and possibly other versions allows remote attackers to perfor

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HIGH 7.5DOWNGRADE

CVE-2003-0363 is a high-severity flaw (CVSS 7.5) affecting licq. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Format string vulnerability in LICQ 1.2.6, 1.0.3 and possibly other versions allows remote attackers to perform unknown actions via format string specifiers.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	1.4% (top 28%)
CISA exploited list	No
Published	2003-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: licq

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

Am I affected?

Timeline

2003-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:02 UTCUpdated Record last modified

licq licq DOWNGRADE

Affected: 1.0.3 · 1.2.6

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.3

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0.3 (Debian / Ubuntu)

apt-cache madison licq sudo apt install licq=<VERSION_BEFORE_1.0.3> sudo apt-mark hold licq

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list licq sudo dnf downgrade licq-<VERSION_BEFORE_1.0.3> sudo dnf versionlock add licq

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2003-0363?

licq: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2003-0363 being exploited?

CVE-2003-0363 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-2003-0363 affect?

CVE-2003-0363 affects licq. Severity is high (CVSS 7.5). Format string vulnerability in LICQ 1.2.6, 1.0.3 and possibly other versions allows remote attackers to perform unknown actions via format string specifiers.

How urgent is CVE-2003-0363?

Priority 44/100. High severity

Related CVEs

CVE-2008-1996 MEDIUM 5.0 DOWNGRADE licq before 1.3.6 allows remote attackers to cause a denial of service (file-descriptor exhaustion and applica
CVE-2002-0251 HIGH 7.5 DOWNGRADE Buffer overflow in licq 1.0.4 and earlier allows remote attackers to cause a denial of service (crash) and pos
CVE-2001-0440 HIGH 7.5 UPGRADE MITIGATE Buffer overflow in logging functions of licq before 1.0.3 allows remote attackers to cause a denial of service
CVE-2001-0439 HIGH 7.5 UPGRADE MITIGATE licq before 1.0.3 allows remote attackers to execute arbitrary commands via shell metacharacters in a URL.

References

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