CVE-2025-50334
Published: 08 January 2026
Summary
CVE-2025-50334 is a high-severity Allocation of Resources Without Limits or Throttling (CWE-770) vulnerability in Technitium Dnsserver. Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 40.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
This control implements explicit throttling on session allocation, addressing the weakness of allocating resources without limits.
Plan testing exercises resource allocation limits and throttling during simulated failures, directly addressing weaknesses that allow unbounded resource use.
Contingency plan updates ensure recovery strategies address unbounded resource allocation, making it harder for attackers to exploit lack of throttling to cause prolonged outages.
Provides continuity when unbounded resource allocation at the primary site leads to exhaustion and downtime.
Alternate services allow operations to continue when primary allocation of resources lacks limits or throttling.
Explicit planning of security-related actions requires defining limits, windows, and resource allocations, making allocation without throttling far less likely.
Measures of performance include tracking allocation behavior and throttling effectiveness, reducing the window for resource exhaustion attacks.
Imposes an inactivity-based limit on network resource allocation, throttling the number of concurrently held connections.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct remote exploitation of rate-limiting flaw (CWE-770) in DNS server enables application/service DoS via T1499.004.
NVD Description
An issue in Technitium DNS Server v.13.5 allows a remote attacker to cause a denial of service via the rate-limiting component
Deeper analysisAI
CVE-2025-50334 is a denial-of-service vulnerability in Technitium DNS Server version 13.5. The flaw exists in the rate-limiting component, enabling a remote attacker to trigger a DoS condition. It carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) and is linked to CWE-770 (Allocation of Resources Without Limits or Throttling). The vulnerability was published on 2026-01-08.
The attack requires network access and can be carried out remotely by an unauthenticated attacker with low complexity and no user interaction. Exploitation leads to high-impact disruption of availability, potentially rendering the DNS server unresponsive, while confidentiality and integrity remain unaffected.
Mitigation guidance appears in referenced advisories and resources, including the Technitium website at http://technitium.com, a GitHub security advisory at https://github.com/FPokerFace/Security-Advisory/tree/main/CVE-2025-50334, the DnsServer CHANGELOG at https://github.com/TechnitiumSoftware/DnsServer/blob/master/CHANGELOG.md, vulnerable source code at https://github.com/TechnitiumSoftware/DnsServer/blob/v13.3/DnsServerCore/Dns/DnsServer.cs, and a related commit at https://github.com/TechnitiumSoftware/DnsServer/commit/7229b217238213cc6275eea68a7e17d73df1603e. Security practitioners should consult these for patch details and upgrade recommendations.
Details
- CWE(s)