CVE-2007-1503: Multiple format string vulnerabilities in comm.c in Rhapsody IRC 0.28b allow remote attackers to execute arbit

This month

HIGH 7.5DOWNGRADE

CVE-2007-1503 is a high-severity flaw (CVSS 7.5) affecting rhapsody irc. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple format string vulnerabilities in comm.c in Rhapsody IRC 0.28b allow remote attackers to execute arbitrary code via format string specifiers to the create_ctcp_message function using the message argument to the (1) me or (2) ctcp commands, and possibly related vectors involving the (3) whois, (4) mode, and (5) topic commands.

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	3.4% (top 11%)
CISA exploited list	No
Published	2007-03-19
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: rhapsody irc

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

Am I affected?

Timeline

2007-03-19 22:19 UTCPublished CVE record published
2026-06-16 22:37 UTCUpdated Record last modified

rhapsody irc rhapsody irc DOWNGRADE

Affected: 0.28b

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.28b

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.28b (Debian / Ubuntu)

apt-cache madison rhapsody-irc sudo apt install rhapsody-irc=<VERSION_BEFORE_0.28b> sudo apt-mark hold rhapsody-irc

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

dnf --showduplicates list rhapsody-irc sudo dnf downgrade rhapsody-irc-<VERSION_BEFORE_0.28b> sudo dnf versionlock add rhapsody-irc

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-2007-1503?

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

Is CVE-2007-1503 being exploited?

CVE-2007-1503 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-2007-1503 affect?

CVE-2007-1503 affects rhapsody irc. Severity is high (CVSS 7.5). Multiple format string vulnerabilities in comm.c in Rhapsody IRC 0.28b allow remote attackers to execute arbitrary code via format string specifiers to the create_ctcp_message function using the message argument to the (1) me or (2) ctcp co

How urgent is CVE-2007-1503?

Priority 48/100. High severity

Related CVEs

CVE-2007-1502 MEDIUM 6.8 DOWNGRADE Multiple buffer overflows in Rhapsody IRC 0.28b allow remote attackers to execute arbitrary code via a (1) lon

References

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