CVE-2009-3602: n/a vulnerability

CVE-2009-3602: Unbound before 1.3.4 does not properly verify signatures for NSEC3 records, which allows remote attackers t...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 7, 2024, 06:31 UTC (UTC+00:00)

Security readout for executives and security teams

Older Unbound DNS resolvers before 1.3.4 may fail to properly validate certain DNSSEC NSEC3 signatures. An attacker using DNS spoofing or related DNS manipulation could downgrade secure delegations, weakening DNSSEC protections and trust in name resolution. Exposure is most likely in legacy environments still running Unbound versions older than 1.3.4 or old vendor packages based on those releases. Current supported distributions are less likely affected. Treat this as legacy infrastructure hygiene unless an affected resolver is found. If present on critical DNS infrastructure, remediate promptly because DNSSEC trust decisions can affect downstream business services. Mitigation focus: Identify any Unbound resolver versions older than 1.3.4.; Upgrade Unbound to 1.3.4 or a vendor-supported fixed package.; Review Debian or vendor advisories for package-specific fixed versions..

Prepared: Jun 28, 2026, 18:15 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Oct 13, 2009, 10:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

0Timeline events

0ADP providers

2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
unbound-nsec3-security-bypass(53729)CVE reference · vdb-entry, x_refsource_XF

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

CWE details

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