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    CVE-2008-1637

    PowerDNS Recursor before 3.1.5 uses insufficient randomness to calculate (1) TRXID values and (2) UDP source port numbers, which makes it easier for remote attackers to poison a DNS cache, related to (a) algorithmic deficiencies in rand and random functions in external libraries, (b) use of a 32-bit seed value, and (c) choice of the time of day as the sole seeding information.

    Published:Mar 31, 2008
    Last Modified:Apr 23, 2026
    EPS:Apr 2, 2008
    EPSS Score:0.00027
    CVSS Score:6.8

    Affected Products

    Vendor
    Powerdns
    Product
    Recursor

    Exploits

    http://doc.powerdns.com/powerdns-advisory-2008-01.htmlhttp://secunia.com/advisories/29584http://www.trusteer.com/docs/PowerDNS_recursor_DNS_Cache_Poisoning.pdfhttp://www.trusteer.com/docs/powerdnsrecursor.htmlhttp://doc.powerdns.com/powerdns-advisory-2008-01.htmlhttp://secunia.com/advisories/29584http://www.trusteer.com/docs/PowerDNS_recursor_DNS_Cache_Poisoning.pdfhttp://www.trusteer.com/docs/powerdnsrecursor.html

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-52688 (CVSS 7.5) — RRSIGs with too few labels can lead to bypass of DNSSEC wildcard validation…
    CVE-2026-52686 (CVSS 3.7) — The issue is a DNSSEC validation bypass where wildcard expansion proofs (NSEC/NSEC3 records) are accepted with…
    CVE-2026-52684 (CVSS 3.7) — If the auth responds very slowly and the records expire in between, the capping of TTLs is not enforced for la…
    CVE-2026-42389 (CVSS 5.3) — This fix provides extra hardening for the 5.4.x branch by doing extra validation of incoming answers from auth…
    CVE-2026-52690 (CVSS 5.9) — Spoofing replies to Recursor might mark an IP of an authoritative server as not supporting EDNS, causing valdi…
    CVE-2026-42390 (CVSS 5.3) — An invalid zone might pass ZONEMD validation while it should not. This is only relevant if ZoneToCache is conf…
    CVE-2026-42388 (CVSS 5.9) — Incomplete validation of the SOA record present in a catalog zone might lead to a crash.…
    CVE-2026-42387 (CVSS 5.9) — A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to a crash of…
    CVE-2026-40012 (CVSS 5.3) — ECS zero scoped answers are stored in the packet cache while they should not. This impacts only configurations…
    CVE-2026-33612 (CVSS 7.5) — A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to cache pois…

    References

    http://doc.powerdns.com/changelog.html
    http://doc.powerdns.com/powerdns-advisory-2008-01.html
    http://lists.opensuse.org/opensuse-security-announce/2008-06/msg00001.html
    http://secunia.com/advisories/29584
    http://secunia.com/advisories/29737
    http://secunia.com/advisories/29764
    http://secunia.com/advisories/29830
    http://secunia.com/advisories/30581
    http://security.gentoo.org/glsa/glsa-200804-22.xml
    http://www.debian.org/security/2008/dsa-1544
    http://www.securityfocus.com/archive/1/490330/100/0/threaded
    http://www.securityfocus.com/bid/28517
    http://www.trusteer.com/docs/PowerDNS_recursor_DNS_Cache_Poisoning.pdf
    http://www.trusteer.com/docs/powerdnsrecursor.html
    http://www.vupen.com/english/advisories/2008/1046/references
    https://exchange.xforce.ibmcloud.com/vulnerabilities/41534
    https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00198.html
    https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00224.html
    http://doc.powerdns.com/changelog.html
    http://doc.powerdns.com/powerdns-advisory-2008-01.html
    http://lists.opensuse.org/opensuse-security-announce/2008-06/msg00001.html
    http://secunia.com/advisories/29584
    http://secunia.com/advisories/29737
    http://secunia.com/advisories/29764
    http://secunia.com/advisories/29830
    http://secunia.com/advisories/30581
    http://security.gentoo.org/glsa/glsa-200804-22.xml
    http://www.debian.org/security/2008/dsa-1544
    http://www.securityfocus.com/archive/1/490330/100/0/threaded
    http://www.securityfocus.com/bid/28517
    http://www.trusteer.com/docs/PowerDNS_recursor_DNS_Cache_Poisoning.pdf
    http://www.trusteer.com/docs/powerdnsrecursor.html
    http://www.vupen.com/english/advisories/2008/1046/references
    https://exchange.xforce.ibmcloud.com/vulnerabilities/41534
    https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00198.html
    https://www.redhat.com/archives/fedora-package-announce/2008-April/msg00224.html

    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