| Name | 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 1106207 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| dnsdist (PTS) | bullseye | 1.5.1-3 | vulnerable |
| bookworm | 1.7.3-2 | vulnerable | |
| trixie | 1.9.9-1 | vulnerable | |
| sid | 1.9.10-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| dnsdist | source | (unstable) | 1.9.10-1 | 1106207 |
https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.html
https://github.com/PowerDNS/pdns/pull/15572
Fixed by: https://github.com/PowerDNS/pdns/commit/096c0fc0c015e80f815eb99aea1bc0eca28cb269 (dnsdist-1.9.10)
Fixed by: https://github.com/PowerDNS/pdns/commit/3a2a8dfdf0d9e43ba13973d31e3c6fb2da228099 (dnsdist-1.9.10)