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    CVE-2009-3602

    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.

    Published:Oct 13, 2009
    Last Modified:Apr 23, 2026
    EPS:Oct 13, 2009
    EPSS Score:0.01644
    CVSS Score:7.5

    Affected Products

    Vendor
    Nlnetlabs
    Product
    Unbound

    Exploits

    No exploit reference

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-56444 (CVSS 5.9) — In NLnet Labs Unbound 1.20.0 up to and including 1.25.1, when Unbound is configured with 'serve-expired: yes' …
    CVE-2026-56416 (CVSS 4.8) — In NLnet Labs Unbound up to and including version 1.25.1, when the validator builds the canonical RDATA form f…
    CVE-2026-55991 (CVSS 5.9) — In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, a remote unauthenticated client can trigger a libngtc…
    CVE-2026-55990 (CVSS 5.9) — In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when the 'dnscrypt:' clause lists more 'dnscrypt-provi…
    CVE-2026-55717 (CVSS 5.9) — In NLnet Labs Unbound 1.10.0 up to and including 1.25.1, when 'serve-expired: yes' is set together with a 'res…
    CVE-2026-55708 (CVSS 3.1) — In NLnet Labs Unbound 1.6.0 up to and including 1.25.1, the 'view_local_data' and 'view_local_datas' commands …
    CVE-2026-54478 (CVSS 3.7) — In NLnet Labs Unbound 1.18.0 up to and including 1.25.1, when Unbound listens on a 'proxy-protocol-port' inter…
    CVE-2026-52863 (CVSS 5.9) — In NLnet Labs Unbound 1.25.0 up to and including 1.25.1, a fix that makes the 'respip' and 'dns64' modules wor…
    CVE-2026-50252 (CVSS 5.7) — In NLnet Labs Unbound 1.4.22 up to and including 1.25.1, UDP source port is randomized and intended to serve a…
    CVE-2026-50251 (CVSS 5.3) — In NLnet Labs Unbound up to and including version 1.25.1, when 'unwanted-reply-threshold' is enabled (set to a…

    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
    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High