CVE-2006-2073: Unspecified vulnerability in ISC BIND allows remote attackers to cause a denial of service via a crafted DNS m

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MEDIUM 5.0DOWNGRADE

CVE-2006-2073 is a medium-severity flaw (CVSS 5.0) affecting bind. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Unspecified vulnerability in ISC BIND allows remote attackers to cause a denial of service via a crafted DNS message with a "broken" TSIG, as demonstrated by the OUSPG PROTOS DNS test suite.

Why this priority

EPSS top 5%: very likely to be exploited

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

Risk facts

CVSS score	5.0 (Medium)
EPSS exploit chance	8.1% (top 5%)
CISA exploited list	No
Published	2006-04-27
Last modified	2026-10-24

Publisher (CNA): MITRE · Vendor: isc

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2006-04-27 22:02 UTCPublished CVE record published
2026-10-24 19:10 UTCUpdated Record last modified

isc bind DOWNGRADE

Affected: 9.0 · 9.0.1 · 9.1 · 9.1.1 · 9.1.2 · 9.1.3 · 9.2.0 · 9.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 9.0 (Debian / Ubuntu)

apt-cache madison bind sudo apt install bind=<VERSION_BEFORE_9.0> sudo apt-mark hold bind

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

dnf --showduplicates list bind sudo dnf downgrade bind-<VERSION_BEFORE_9.0> sudo dnf versionlock add bind

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-2006-2073?

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

Is CVE-2006-2073 being exploited?

CVE-2006-2073 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-2006-2073 affect?

CVE-2006-2073 affects bind. Severity is medium (CVSS 5.0). Unspecified vulnerability in ISC BIND allows remote attackers to cause a denial of service via a crafted DNS message with a "broken" TSIG, as demonstrated by the OUSPG PROTOS DNS test suite.

How urgent is CVE-2006-2073?

Priority 41/100. EPSS top 5%: very likely to be exploited

Software pages

BIND DNS vulnerabilities

Related CVEs

CVE-2023-2828 HIGH 7.5 UPGRADE MITIGATE Every `named` instance configured to run as a recursive resolver maintains a cache database holding the respon
CVE-2023-2911 HIGH 7.5 UPGRADE MITIGATE If the `recursive-clients` quota is reached on a BIND 9 resolver configured with both `stale-answer-enable yes
CVE-2023-2829 HIGH 7.5 UPGRADE MITIGATE A `named` instance configured to run as a DNSSEC-validating recursive resolver with the Aggressive Use of DNSS

References

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