CVE-2002-0140: Domain Name Relay Daemon (dnrd) 2.10 and earlier allows remote malicious DNS sites to cause a denial of servic

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HIGH 7.5DOWNGRADE

CVE-2002-0140 is a high-severity flaw (CVSS 7.5) affecting dnrd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Domain Name Relay Daemon (dnrd) 2.10 and earlier allows remote malicious DNS sites to cause a denial of service and possibly execute arbitrary code via a long or malformed DNS reply, which is not handled properly by parse_query, get_objectname, and possibly other functions.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	3.5% (top 11%)
CISA exploited list	No
Published	2002-03-25
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: dnrd

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

Am I affected?

Timeline

2002-03-25 05:00 UTCPublished CVE record published
2026-06-16 21:56 UTCUpdated Record last modified

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: DNRD 1.x/2.x - DNS Request/Reply Denial of Service

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-2002-0140?

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

Is CVE-2002-0140 being exploited?

CVE-2002-0140 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-2002-0140 affect?

CVE-2002-0140 affects dnrd. Severity is high (CVSS 7.5). Domain Name Relay Daemon (dnrd) 2.10 and earlier allows remote malicious DNS sites to cause a denial of service and possibly execute arbitrary code via a long or malformed DNS reply, which is not handled properly by parse_query, get_objectn

How urgent is CVE-2002-0140?

Priority 54/100. High severity; Public exploit reference

Related CVEs

CVE-2005-2316 MEDIUM 5.0 DOWNGRADE Domain Name Relay Daemon (DNRD) before 2.19.1 allows remote attackers to cause a denial of service (infinite r
CVE-2005-2315 HIGH 7.5 DOWNGRADE Buffer overflow in Domain Name Relay Daemon (DNRD) before 2.19.1 allows remote attackers to execute arbitrary
CVE-2005-0037 MEDIUM 5.0 DOWNGRADE The DNS implementation of DNRD before 2.10 allows remote attackers to cause a denial of service via a compress
CVE-2004-0789 MEDIUM 5.0 DOWNGRADE DOWNGRADE Multiple implementations of the DNS protocol, including (1) Poslib 1.0.2-1 and earlier as used by Posadis, (2)

References

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