Vulnerability Report

CVE-2009-4008

Title: Nlnetlabs Unbound Denial of Service (DoS)

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2009-4008.

CWE Category CWE-399

Published Date Jun 02, 2011

Modified Date Jun 16, 2026

Exploit Status Not Found

Score 5.0 CVSS v2.0

Exploit Probability (EPSS)

2.70%

Vulnerability Summary

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.

Impacted Vendors

nlnetlabs 1

unbound 1

fedoraproject 1

Reference Links

http://packages.debian.org/changelogs/pool/main/u/unbound/unbound_1.4.6-1/changelog http://unbound.nlnetlabs.nl/downloads/unbound-1.4.4.tar.gz http://www.debian.org/security/2011/dsa-2243 http://packages.debian.org/changelogs/pool/main/u/unbound/unbound_1.4.6-1/changelog http://unbound.nlnetlabs.nl/downloads/unbound-1.4.4.tar.gz http://www.debian.org/security/2011/dsa-2243

CVSS v2.0

Source Entity [email protected]

Severity MEDIUM

5.0

Access Vector

N/A

Authentication

N/A

RAW VECTOR AV:N/AC:L/Au:N/C:N/I:N/A:P

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2009-4008 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 16, 2026 MODIFIED

Vulnerability data updated via NVD.

April 29, 2026 MODIFIED

Vulnerability data updated via NVD.

April 11, 2025 MODIFIED

Vulnerability data or affected products updated.

June 02, 2011 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector N/A

Complexity N/A

Privileges N/A

Interaction NONE

CVSS Vector String


                                    AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected Stack

No specific products linked.