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CVE-2009-3602

7.5 · HIGH

Unbound before 1.3.4 does not properly verify signatures for NSEC3 records, which allows remote attackers to cause secure delegations to be downgraded via DNS spoofing or other DNS-related attacks…

Published Oct 13, 2009nlnetlabsCWE-310EPSS 2.98%

Overview

CVE-2009-3602 is a high-severity vulnerability affecting nlnetlabs unbound. It was published on October 13, 2009 and has a CVSS 2.0 base score of 7.5 (HIGH).

This vulnerability has a CVSS 2.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

Unbound before 1.3.4 does not properly verify signatures for NSEC3 records, which allows remote attackers to cause secure delegations to be downgraded via DNS spoofing or other DNS-related attacks in conjunction with crafted delegation responses.

Remediation

Check the references section for vendor advisories and patches from nlnetlabs. Update unbound to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
nlnetlabsunbound0Affected

References

Refosvdb.org/58836Refsecunia.com/advisories/36996Refsecunia.com/advisories/37913Refunbound.net/pipermail/unbound-users/2009-October/000852.htmlRefwww.debian.org/security/2009/dsa-1963Refwww.openwall.com/lists/oss-security/2009/10/09/2Refwww.openwall.com/lists/oss-security/2009/10/09/3Refwww.vupen.com/english/advisories/2009/2875Refexchange.xforce.ibmcloud.com/vulnerabilities/53729Refosvdb.org/58836

How CyberStrike helps

Frequently asked questions

What is CVE-2009-3602?

CVE-2009-3602 is a high-severity vulnerability affecting nlnetlabs unbound. It was published on October 13, 2009 and has a CVSS 2.0 base score of 7.5 (HIGH).

How severe is CVE-2009-3602?

This vulnerability has a CVSS 2.0 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-3602?

Check the references section for vendor advisories and patches from nlnetlabs. Update unbound to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-3602?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-3602 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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