dnsdist: In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP c...
CVE-2025-30193 is fixed in dnsdist on 1 platform, first by dnsdist 1.6.1-1ubuntu0.1~esm2, released May 20, 2025. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dnsdist · Debian 13.5 (trixie) | 1.9.10-1 | DEBIAN-CVE-2025-30193 | May 20, 2025 |
| dnsdist · Debian 14 | 1.9.10-1 | DEBIAN-CVE-2025-30193 | May 20, 2025 |
| dnsdist · Ubuntu 22.04.1 LTS (jammy) | 1.6.1-1ubuntu0.1~esm2 | dnsdist 1.6.1-1ubuntu0.1~esm2 | May 20, 2025 |
| dnsdist · Ubuntu 24.04.5 LTS (noble) | 1.8.3-2ubuntu0.1~esm1 | dnsdist 1.8.3-2ubuntu0.1~esm1 | Aug 13, 2025 |
| dnsdist · opensuse-leap 15.6 | 1.8.0-150400.9.6.1 | SUSE-SU-2025:01745-1 | May 29, 2025 |
| dnsdist · sles 15.6 | 1.8.0-150400.9.6.1 | SUSE-SU-2025:01745-1 | May 29, 2025 |
| dnsdist · sles 15.7 | 1.9.10-150700.3.3.1 | SUSE-SU-2025:01743-1 | May 29, 2025 |
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