Vulnerability · Published Sep 18, 2025 · Assigned by OX
CVE-2025-30187Denial of service via crafted DoH exchange in PowerDNS DNSdist
Low 3.7
In plain English
A low-severity infinite loop in DNSdist from PowerDNS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.3%top 76.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | dnsdist | 2.0.1-r0 | ALPINE-CVE-2025-30187 |
| Alpine:v3.24 | dnsdist | 2.0.1-r0 | ALPINE-CVE-2025-30187 |
| Debian:13 | dnsdist | 1.9.10-1+deb13u1 | DEBIAN-CVE-2025-30187 |
| Debian:14 | dnsdist | 2.0.1-1 | DEBIAN-CVE-2025-30187 |
| Ubuntu:25.10 | dnsdist | 1.9.10-1ubuntu0.1 | USN-8037-1 |
| Ubuntu:25.10 | dnsdist | 1.9.10-1ubuntu0.1 | UBUNTU-CVE-2025-30187 |
Affected products (as reported)
Weakness: CWE-835 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L