CVE-2005-3780: Multiple buffer overflows in IPUpdate 1.1 might allow attackers to execute arbitrary code via (1) memmcat in t

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HIGH 7.5DOWNGRADE

CVE-2005-3780 is a high-severity flaw (CVSS 7.5) affecting ipupdate. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple buffer overflows in IPUpdate 1.1 might allow attackers to execute arbitrary code via (1) memmcat in the memm module or (2) certain TSIG format records.

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	2.7% (top 14%)
CISA exploited list	No
Published	2005-11-23
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: ipupdate

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

Am I affected?

Timeline

2005-11-23 01:03 UTCPublished CVE record published
2026-06-16 22:17 UTCUpdated Record last modified

ipupdate ipupdate DOWNGRADE

Affected: 1.0 · 1.0.1 · 1.0.2 · 1.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison ipupdate sudo apt install ipupdate=<VERSION_BEFORE_1.0> sudo apt-mark hold ipupdate

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

dnf --showduplicates list ipupdate sudo dnf downgrade ipupdate-<VERSION_BEFORE_1.0> sudo dnf versionlock add ipupdate

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-2005-3780?

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

Is CVE-2005-3780 being exploited?

CVE-2005-3780 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-2005-3780 affect?

CVE-2005-3780 affects ipupdate. Severity is high (CVSS 7.5). Multiple buffer overflows in IPUpdate 1.1 might allow attackers to execute arbitrary code via (1) memmcat in the memm module or (2) certain TSIG format records.

How urgent is CVE-2005-3780?

Priority 48/100. High severity

References

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