CVE-2025-30193 – DNSdist TCP Stack Exhaustion Denial of Service Vulnerability

CVE ID : CVE-2025-30193

Published : May 20, 2025, 12:15 p.m. | 54 minutes ago

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.

Severity: 7.5 | HIGH

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