CVE-2025-30194

HIGH EPSS 78.1%
Published Apr 29, 20251y ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published Apr 29, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
78.1% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

References 4

  • openwall.com http://www.openwall.com/lists/oss-security/2025/04/29/1
  • dnsdist.org https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-02.html
  • vicarius.io https://www.vicarius.io/vsociety/posts/cve-2025-30194-detection-dnsdist-vulnerability
  • vicarius.io https://www.vicarius.io/vsociety/posts/cve-2025-30194-mitigate-dnsdist-vulnerability

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.