CVE-2025-30193
highpriority · track · 0EPSS 0.006 · 49 %ileEURUEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (36)
Products and version ranges known to be affected.
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (5)
External citations — patches, advisories, analysis.
- https://access.redhat.com/security/cve/cve-2025-30193cnnvd
- https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.htmlcnnvd
- https://vigilance.fr/vulnerability/DNSdist-overload-via-Unlimited-Queries-47304cnnvd
- https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.htmlenisa_euvd
- https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.htmlnvd
Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.
Free scan