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Fencer Vulns
medium 6.8

CVE-2008-1637 json

PowerDNS Recursor before 3.1.5 uses insufficient randomness to calculate (1) TRXID values and (2) UDP source port numbers, which makes it e…

published 2008-04-02 18 y ago modified 2026-06-16 4 mo ago also EUVD-2008-1638

cvss
6.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.0%
EPSS 4.0% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

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.

Patch / fix

  • pdns-recursor Debian 14, Debian 13, Debian 12 3.1.7-1

debian advisories DEBIAN-CVE-2008-1637

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2008-1637 updated

pdns-recursor: perdictable query ids

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.96% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • doc.powerdns.com http://doc.powerdns.com/powerdns-advisory-2008-01.html referenced PoC, tagged "exploit" by a source, unverified
  • trusteer.com http://www.trusteer.com/docs/powerdnsrecursor.html referenced PoC, tagged "exploit" by a source, unverified
  • secunia.com http://secunia.com/advisories/29584 referenced PoC, tagged "exploit" by a source, unverified
  • trusteer.com http://www.trusteer.com/docs/PowerDNS_recursor_DNS_Cache_Poisoning.pdf referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.