Is CVE-2025-50334 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2025-50334 being exploited in the wild.

How severe is CVE-2025-50334?

High severity, with a CVSS score of 7.5, published 8 January 2026.

Which products and versions are affected?

Technitium DNS Server up to and including 13.6.

Is there a fix for CVE-2025-50334?

A patch was published on 2026-01-08: Fix released in version 14.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2025-50334 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2025-50334?

Check whether you run Technitium Dnsserver. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2025-50334: Technitium DNS Server denial of service in rate-limiting component

CVE-2025-50334 · Severity: high · CVSS 7.5 · Published 2026-01-08

Technitium DNS Server, a tool used for managing internet domain name requests, contains a flaw in how it limits incoming traffic. An attacker can exploit this to trick the server into blocking legitimate users from entire network blocks (subnets). This results in a denial of service, preventing users from accessing websites or services that rely on that DNS server.

Technologies: Technitium Dnsserver. Vendors: Technitium.

Quick answers

Is CVE-2025-50334 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2025-50334 being exploited in the wild.
How severe is CVE-2025-50334?: High severity, with a CVSS score of 7.5, published 8 January 2026.
Which products and versions are affected?: Technitium DNS Server up to and including 13.6.
Is there a fix for CVE-2025-50334?: A patch was published on 2026-01-08: Fix released in version 14.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2025-50334 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2025-50334?: Check whether you run Technitium Dnsserver. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A denial of service (DoS) vulnerability exists in Technitium DNS Server (up to version 13.6) within its rate-limiting component. The vulnerability, classified as CWE-770, allows a remote, unauthenticated attacker to spoof source IP addresses to trigger rate-limiting thresholds. Because the server applies these limits across entire IPv4 /24 or IPv6 /56 subnets, an attacker can effectively blacklist legitimate traffic from those subnets. This affects the software in both recursive resolver and authoritative name server configurations. The issue is resolved in version 14.0, which introduces a redesigned rate-limiting implementation.

Affected products

Technitium DNS Server up to and including 13.6

Timeline

2025-11-08: disclosed: Vulnerability reported to vendor by researchers from Tsinghua University.
2026-01-08: advisory: CVE published and NVD record created.
2026-01-08: patched: Fix released in version 14.0.

References

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