#VU109600 Resource exhaustion in dnsdist - CVE-2025-30193

Vulnerability identifier: #VU109600

Vulnerability 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-2025-30193

CWE-ID: CWE-400

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
dnsdist
Server applications / Other server solutions

Vendor: PowerDNS.COM B.V.

Description

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

The vulnerability exists due to insufficient validation of incoming TCP connections from the client. A remote attacker can initiate a crafted TCP exchange and perform a denial of service (DoS) attack through stack exhaustion.

Mitigation
Install update from vendor's website.

Vulnerable software versions

dnsdist: 1.0.0 - 1.9.9

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External links
https://dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2025-03.html

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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.