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Technitium DNS Server CVE-2026-45557

| EUVD-2026-30938 MEDIUM
Asymmetric Resource Consumption (Amplification) (CWE-405)
2026-05-19 cisa-cg GHSA-vpfg-gc96-vg45
Information Disclosure
6.9
CVSS 4.0
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CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
CVSS changed
May 19, 2026 - 15:22 NVD
5.8 (MEDIUM) 6.9 (MEDIUM)
Analysis Generated
May 19, 2026 - 15:02 vuln.today

DescriptionNVD

Technitium DNS Server aggressively tries to fetch missing RRSIG records or mismatched DNSKEY records. An attacker in control of a domain can cause a vulnerable system to generate excessive network traffic. Fixed in 15.0.

AnalysisAI

Technitium DNS Server performs amplified outbound DNS traffic when processing domains with missing RRSIG records or mismatched DNSKEY records - an attacker who controls any domain can exploit this behavior to force the resolver into generating excessive network queries against third-party infrastructure. All versions prior to 15.0 are affected per the vendor CPE listing (cpe:2.3:a:technitium:dns_server:*:*:*:*:*:*:*:*). …

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CVE-2026-45557 vulnerability details – vuln.today
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