CVE-2025-30187
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-18

Last updated on: 2025-11-04

Assigner: Open-Xchange

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.
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Meta Information
Published
2025-09-18
Last Modified
2025-11-04
Generated
2026-06-16
AI Q&A
2025-09-18
EPSS Evaluated
2026-06-14
NVD
CVE-2025-30187
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
powerdns dnsdist 1.9.0
powerdns dnsdist 1.9.10
powerdns dnsdist 2.0.0
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-835 The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
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Executive Summary

This vulnerability occurs in DNSdist when it is configured to use the nghttp2 library for processing DNS over HTTPS (DoH) queries. An attacker can craft a specially designed DoH exchange that triggers an unbounded input/output read loop, which leads to excessive CPU usage and causes a denial of service.

Impact Analysis

The vulnerability can cause a denial of service by consuming excessive CPU resources on the affected system, potentially making the DNSdist service unavailable or degraded in performance.

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