CVE-2025-30193

Description

In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service. The remedy is: upgrade to the patched 1.9.10 version. A workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting. We would like to thank Renaud Allard for bringing this issue to our attention.

Reserved 2025-03-18 | Published 2025-05-20 | Updated 2025-05-20 | Assigner OX

Problem types

CWE-674 Uncontrolled Recursion

Product status

Default status
affected

1.9.10
unaffected

Credits

Renaud Allard finder

References

dnsdist.org/...es/powerdns-advisory-for-dnsdist-2025-03.html

cve.org (CVE-2025-30193)

nvd.nist.gov (CVE-2025-30193)

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