CVE-2004-0789: Multiple implementations of the DNS protocol, including (1) Poslib 1.0.2-1 and earlier as used by Posadis, (2)

Routine

MEDIUM 5.0DOWNGRADEDOWNGRADEDOWNGRADE

CVE-2004-0789 is a medium-severity flaw (CVSS 5.0) affecting delegate, dnrd, mydns. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Multiple implementations of the DNS protocol, including (1) Poslib 1.0.2-1 and earlier as used by Posadis, (2) Axis Network products before firmware 3.13, and (3) Men & Mice Suite 2.2x before 2.2.3 and 3.5.x before 3.5.2, allow remote attackers to cause a denial of service (CPU and network bandwidth consumption) by triggering a communications loop via (a) DNS query packets with localhost as a spoofed source address, or (b) a response packet that

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	2.8% (top 14%)
CISA exploited list	No
Published	2004-12-31
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: delegate · dnrd · don moore · maradns · pliant · posadis

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

Am I affected?

Timeline

2004-12-31 05:00 UTCPublished CVE record published
2026-06-16 22:06 UTCUpdated Record last modified

delegate delegate DOWNGRADE

Affected: 7.7.0 · 7.7.1 · 7.8.0 · 7.8.1 · 7.8.2 · 7.9.11 · 8.3.3 · 8.3.4

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.7.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 7.7.0 (Debian / Ubuntu)

apt-cache madison delegate sudo apt install delegate=<VERSION_BEFORE_7.7.0> sudo apt-mark hold delegate

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

dnf --showduplicates list delegate sudo dnf downgrade delegate-<VERSION_BEFORE_7.7.0> sudo dnf versionlock add delegate

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.

dnrd dnrd DOWNGRADE

Affected: 1.0 · 1.1 · 1.2 · 1.3 · 1.4 · 2.0 · 2.1 · 2.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

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

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

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

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

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.

don moore mydns DOWNGRADE

Affected: 0.6 · 0.7 · 0.8 · 0.9 · 0.10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.6

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.6 (Debian / Ubuntu)

apt-cache madison mydns sudo apt install mydns=<VERSION_BEFORE_0.6> sudo apt-mark hold mydns

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

dnf --showduplicates list mydns sudo dnf downgrade mydns-<VERSION_BEFORE_0.6> sudo dnf versionlock add mydns

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.

maradns maradns DOWNGRADE

Affected: 0.5.28 · 0.5.29 · 0.5.30 · 0.5.31 · 0.8.05

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.5.28

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.5.28 (Debian / Ubuntu)

apt-cache madison maradns sudo apt install maradns=<VERSION_BEFORE_0.5.28> sudo apt-mark hold maradns

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

dnf --showduplicates list maradns sudo dnf downgrade maradns-<VERSION_BEFORE_0.5.28> sudo dnf versionlock add maradns

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.

pliant pliant dns server MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy pliant-dns-server || rpm -q pliant-dns-server || pliant-dns-server --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

posadis posadis DOWNGRADE

Affected: 0.50.4 · 0.50.5 · 0.50.6 · 0.50.7 · 0.50.8 · 0.50.9 · 0.60.0 · 0.60.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.50.4

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.50.4 (Debian / Ubuntu)

apt-cache madison posadis sudo apt install posadis=<VERSION_BEFORE_0.50.4> sudo apt-mark hold posadis

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

dnf --showduplicates list posadis sudo dnf downgrade posadis-<VERSION_BEFORE_0.50.4> sudo dnf versionlock add posadis

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-2004-0789?

delegate: downgrade or apply the listed mitigation; dnrd: downgrade or apply the listed mitigation; mydns: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2004-0789 being exploited?

CVE-2004-0789 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-2004-0789 affect?

CVE-2004-0789 affects delegate, dnrd, mydns. Severity is medium (CVSS 5.0). Multiple implementations of the DNS protocol, including (1) Poslib 1.0.2-1 and earlier as used by Posadis, (2) Axis Network products before firmware 3.13, and (3) Men & Mice Suite 2.2x before 2.2.3 and 3.5.x before 3.5.2, allow remote attac

How urgent is CVE-2004-0789?

Priority 39/100. No elevated risk signals yet.

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References

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