CVE-2009-4008

Name: CVE-2009-4008
Creator: NVD / NIST
Published: 2011-06-02T20:55:01.763+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.67%

Last modified Jun 16, 2026

CVE-2009-4008 is a vulnerability of currently unknown severity. Unbound before 1.4.4 does not send responses for signed zones after mishandling an unspecified query, which allows remote attackers to cause a denial of service (DNSSEC outage) via a crafted query.. EPSS estimates a 2.67% chance of exploitation in the next 30 days.

Description

Unbound before 1.4.4 does not send responses for signed zones after mishandling an unspecified query, which allows remote attackers to cause a denial of service (DNSSEC outage) via a crafted query.

Metrics

EPSS Probability

2.67%

83.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-399

Affected Software

Vendor	Product	Versions
Nlnetlabs	Unbound	<= 1.4.3
Nlnetlabs	Unbound	0.0
Nlnetlabs	Unbound	0.1
Nlnetlabs	Unbound	0.2
Nlnetlabs	Unbound	0.3
Nlnetlabs	Unbound	0.4
Nlnetlabs	Unbound	0.5
Nlnetlabs	Unbound	0.6
Nlnetlabs	Unbound	0.7
Nlnetlabs	Unbound	0.7.1
Nlnetlabs	Unbound	0.7.2
Nlnetlabs	Unbound	0.8
Nlnetlabs	Unbound	0.09
Nlnetlabs	Unbound	0.10
Nlnetlabs	Unbound	0.11
Nlnetlabs	Unbound	1.0.0
Nlnetlabs	Unbound	1.0.1
Nlnetlabs	Unbound	1.0.2
Nlnetlabs	Unbound	1.1.0
Nlnetlabs	Unbound	1.1.1
Nlnetlabs	Unbound	1.2.0
Nlnetlabs	Unbound	1.2.1
Nlnetlabs	Unbound	1.3.0
Nlnetlabs	Unbound	1.3.1
Nlnetlabs	Unbound	1.3.2
Nlnetlabs	Unbound	1.3.3
Nlnetlabs	Unbound	1.3.4
Nlnetlabs	Unbound	1.4.0
Nlnetlabs	Unbound	1.4.1
Nlnetlabs	Unbound	1.4.2

References

Timeline

Published: Jun 2, 2011
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2009-4008?

Unbound before 1.4.4 does not send responses for signed zones after mishandling an unspecified query, which allows remote attackers to cause a denial of service (DNSSEC outage) via a crafted query.

How severe is CVE-2009-4008?

Severity scoring for CVE-2009-4008 is pending analysis. The EPSS model estimates a 2.67% probability of exploitation in the next 30 days.

How do I fix CVE-2009-4008?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2009-4008?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST