CVE-2025-30194: powerdns dnsdist Use After Free
Vulnerability summary
CVE-2025-30194 is a high (CVSS 7.5) Use After Free vulnerability in powerdns dnsdist. EPSS estimates a 2.25% chance of exploitation in the next 30 days, higher than 82.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 29-04-2025PublishedVulnerability first disclosed.
- 20-06-2025Last modifiedVulnerability information updated.
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 metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
2.25%
Chance of exploitation in the next 30 days
Percentile
83%
Versus all other CVEs
30-day change
+0.01 pp
From 2.24% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Debian1 product
- dnsdist< 1.9.9-1
Opensuse1 product
- dnsdist&distro=openSUSE Tumbleweed< 1.9.10-2.1
Powerdns1 product
- dnsdist≥ 1.9.0, < 1.9.9
Ubuntu1 product
- dnsdistAll versions (No fix recorded)
4 vendors · 4 products
References
12 links
Show all 12 references
- lists.opensuse.org/archives/…Advisory