CVE-2025-30194
Publication date 29 April 2025
Last updated 11 July 2025
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| dnsdist | 25.10 questing |
Not affected
|
| 24.04 LTS noble |
Not affected
|
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
7.5 · High
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2025-30194
- https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-02.html
- https://github.com/PowerDNS/pdns/issues/15475
- https://github.com/PowerDNS/pdns/pull/15482
- http://www.openwall.com/lists/oss-security/2025/04/29/1
- https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-02.html