CVE-2025-30194: Denial of service via crafted DoH exchange
First published: Tue Apr 29 2025(Updated: )
When DNSdist is configured to provide DoH via the nghttp2 provider, an attacker can cause a denial of service by crafting a DoH exchange that triggers an illegal memory access (double-free) and crash of DNSdist, causing a denial of service. The remedy is: upgrade to the patched 1.9.9 version. A workaround is to temporarily switch to the h2o provider until DNSdist has been upgraded to a fixed version. We would like to thank Charles Howes for bringing this issue to our attention.
Credit: security@open-xchange.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| PowerDNS | >1.9.9 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-30194?
CVE-2025-30194 is classified as a denial of service vulnerability.
How do I fix CVE-2025-30194?
To fix CVE-2025-30194, upgrade to the patched version of DNSdist, specifically version 1.9.9 or later.
What products are affected by CVE-2025-30194?
CVE-2025-30194 affects PowerDNS DNSdist when configured to provide DoH via the nghttp2 provider.
What type of attack does CVE-2025-30194 involve?
CVE-2025-30194 involves an attacker triggering a denial of service through an illegal memory access leading to a crash.
Is CVE-2025-30194 exploitable remotely?
Yes, CVE-2025-30194 can be exploited remotely by an attacker crafting a specific DoH exchange.
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