CVE-2025-30187: Denial of service via crafted DoH exchange in PowerDNS DNSdist
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 Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-30187?
CVE-2025-30187 has a severity rating that indicates it can cause a denial of service.
How do I fix CVE-2025-30187?
To fix CVE-2025-30187, you should update your PowerDNS DNSdist to the latest version that addresses the vulnerability.
Which versions of PowerDNS DNSdist are affected by CVE-2025-30187?
CVE-2025-30187 affects certain configurations of PowerDNS DNSdist using the nghttp2 library for DNS over HTTPS.
What type of attack is associated with CVE-2025-30187?
CVE-2025-30187 is associated with a denial of service attack resulting from an unbounded I/O read loop.
Is there a known exploit for CVE-2025-30187?
Yes, there is potential for exploitation of CVE-2025-30187 by crafting a malicious DNS over HTTPS exchange.