CVE-2025-59023
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Cache Poisoning Vulnerability in Recursor via Crafted Delegations

Publication date: 2026-02-09

Last updated on: 2026-04-20

Assigner: Open-Xchange

Description
Crafted delegations or IP fragments can poison cached delegations in Recursor.
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Meta Information
Published
2026-02-09
Last Modified
2026-04-20
Generated
2026-06-16
AI Q&A
2026-02-09
EPSS Evaluated
2026-06-15
NVD
CVE-2025-59023
EUVD
EUVD-2025-207361
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
powerdns recursor From 5.1.0 (inc) to 5.1.8 (exc)
powerdns recursor From 5.2.0 (inc) to 5.2.6 (exc)
powerdns recursor From 5.3.0 (inc) to 5.3.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-294 A capture-replay flaw exists when the design of the product makes it possible for a malicious user to sniff network traffic and bypass authentication by replaying it to the server in question to the same effect as the original message (or with minor changes).
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Executive Summary

This vulnerability involves crafted delegations or IP fragments that can poison cached delegations in a Recursor. Essentially, an attacker can manipulate the cached DNS delegation information used by the Recursor, potentially causing it to use incorrect or malicious data.

Impact Analysis

The vulnerability can impact you by allowing an attacker to poison the cached delegations in the Recursor, which may lead to incorrect resolution of domain names. This can result in denial of service or redirection of traffic to malicious sites, impacting the integrity and availability of services.

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