CVE-2009-3602

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2009-10-13 · updated 2026-06-16
Weakness: CWE-310

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.

Affected products

NLnet Labs Unbound: through 1.3.3; 0.0, 0.1, 0.2, 0.3, 0.4, 0.5 (+18)

References

http://osvdb.org/58836
http://secunia.com/advisories/36996
http://secunia.com/advisories/37913
http://unbound.net/pipermail/unbound-users/2009-October/000852.html
http://www.debian.org/security/2009/dsa-1963
http://www.openwall.com/lists/oss-security/2009/10/09/2
http://www.openwall.com/lists/oss-security/2009/10/09/3
http://www.vupen.com/english/advisories/2009/2875
https://exchange.xforce.ibmcloud.com/vulnerabilities/53729
http://osvdb.org/58836
http://secunia.com/advisories/36996
http://secunia.com/advisories/37913

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