CVE-2005-0830: Multiple buffer overflows in Xzabite DYNDNSUpdate 0.6.15 and earlier, including the ipcheck function in dyndns

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HIGH 7.5DOWNGRADE

CVE-2005-0830 is a high-severity flaw (CVSS 7.5) affecting dyndnsupdate. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple buffer overflows in Xzabite DYNDNSUpdate 0.6.15 and earlier, including the ipcheck function in dyndnsupdate.c, allow remote attackers who spoof a dyndns.org server to execute arbitrary code via unknown vectors.

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	3.1% (top 12%)
CISA exploited list	No
Published	2005-05-02
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: xzabite

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

Am I affected?

Timeline

2005-05-02 04:00 UTCPublished CVE record published
2026-06-16 22:11 UTCUpdated Record last modified

xzabite dyndnsupdate DOWNGRADE

Affected: 0.6.15

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.6.15

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.6.15 (Debian / Ubuntu)

apt-cache madison dyndnsupdate sudo apt install dyndnsupdate=<VERSION_BEFORE_0.6.15> sudo apt-mark hold dyndnsupdate

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

dnf --showduplicates list dyndnsupdate sudo dnf downgrade dyndnsupdate-<VERSION_BEFORE_0.6.15> sudo dnf versionlock add dyndnsupdate

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-2005-0830?

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

Is CVE-2005-0830 being exploited?

CVE-2005-0830 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-2005-0830 affect?

CVE-2005-0830 affects dyndnsupdate. Severity is high (CVSS 7.5). Multiple buffer overflows in Xzabite DYNDNSUpdate 0.6.15 and earlier, including the ipcheck function in dyndnsupdate.c, allow remote attackers who spoof a dyndns.org server to execute arbitrary code via unknown vectors.

How urgent is CVE-2005-0830?

Priority 48/100. High severity

References

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