SB20251022166 - DNS cache poisoning in PowerDNS Recursor

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Main Vulnerability Database SB20251022166

SB20251022166 - DNS cache poisoning in PowerDNS Recursor

Published: October 22, 2025

Security Bulletin ID SB20251022166
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 2
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 2 vulnerabilities.


1) Insufficient verification of data authenticity (CVE-ID: CVE-2025-59023)

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to poison DNS cache. 

The vulnerability exists due to software does not apply strict enough validation of received delegation information. A remote attacker can spoof delegation requests and poison DNS cache of the server. 


2) Insufficient verification of data authenticity (CVE-ID: CVE-2025-59024)

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to poison DNS cache. 

The vulnerability exists due to software does not apply strict enough validation of received delegation information. A remote attacker can use an UDP IP fragments attack to poison DNS cache of the server. 


Remediation

Install update from vendor's website.

References