Denial of Service Vulnerability in DNSdist by PowerDNS
CVE-2025-30187

3.7LOW

Key Information:

Vendor

Powerdns

Status
Dnsdist
Vendor
CVE Published:
18 September 2025

What is CVE-2025-30187?

A security flaw exists in DNSdist when utilizing the nghttp2 library for processing DNS over HTTPS (DoH) queries. This flaw enables an attacker to craft a malformed DoH exchange that can induce an unbounded I/O read loop. As a result, the affected system may experience excessive CPU resource consumption, potentially leading to service disruption.

Affected Version(s)

DNSdist 1.9.0 < 1.9.11

DNSdist 2.0.0 < 2.0.1

References

https://www.dnsdist.org/security-advisories/powerdns-advi...

CVSS V3.1

Score:
3.7
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2025-30187 : Denial of Service Vulnerability in DNSdist by PowerDNS