CVE-2025-30194 | Denial of service via crafted DoH exchange

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.

Published: 2025-04-29 Last update: 2026-04-15 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-30194 is rated Low Risk (32.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.03%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-30194

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-07 0.26% 0.03% -0.23%
2 2026-02-23 0.11% 0.26% +0.16%
3 2025-11-21 — 0.11% —

Full EPSS history (6 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-30194

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2025-30194

OS Trackers for CVE-2025-30194

vendor priority summary link
alpine high CVE-2025-30194: 1 source package rows (dnsdist); 7 state rows across 3 repos (3.21-community, 3.22-community, edge-community); fixed 3, open 4. https://security.alpinelinux.org/vuln/CVE-2025-30194
debian unimportant CVE-2025-30194 unimportant priority: Debian including 1 source packages (dnsdist), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-30194
suse high CVE-2025-30194 severity important: SUSE including 4 source package names (dnsdist, dnsdist-1.9.10-150700.3.3.1, dnsdist-1.9.10-160000.2.2, dnsdist-1.9.10-2.1), 20 product×package rows across 20 product lines (SLES-LTSS-TERADATA 15 SP2, SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS, … (20 product lines)): Known Not Affected 17, Fixed 3. https://www.suse.com/security/cve/CVE-2025-30194/
ubuntu medium CVE-2025-30194 medium priority: Ubuntu including 1 source packages (dnsdist), 9 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream, xenial): not-affected 6, ignored 2, released 1. https://ubuntu.com/security/CVE-2025-30194

Affected software / configurations for CVE-2025-30194

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2025-30194

cvelogic Threat Intelligence