Remote denial of service in PowerDNS DNSdist

1) Double free

EUVDB-ID: #VU108042

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-30194

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a double free error when DNSdist is configured to provide DoH via the nghttp2 provider. A remote attacker can initiate a crafted DoH exchange that triggers an illegal memory access and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

dnsdist: 1.9.0 - 1.9.8

CPE2.3

• cpe:2.3:a:powerdns_com_b_v:dnsdist:1.9.0:*:*:*:*:*:*:*
• cpe:2.3:a:powerdns_com_b_v:dnsdist:1.9.1:*:*:*:*:*:*:*
• cpe:2.3:a:powerdns_com_b_v:dnsdist:1.9.2:*:*:*:*:*:*:*

External links

https://www.dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-02.html

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.