CVE-2026-45557 PUBLISHED

Technitium DNS Server excessive DNSSEC requests

Assigner: cisa-cg
Reserved: 12.05.2026 Published: 19.05.2026 Updated: 19.05.2026

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.

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CVSS Score: 5.8

Attack Vector	Network	Scope	Changed
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	Low

CVSS 3.1

CVSS Vector: 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
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	Low	Availability	Low
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Technitium
Product	DNS Server
Versions	Default: unknown affected from 0 to 15.0 (excl.) Version 15.0 is unaffected

Credits

Shuhan Zhang, Tsinghua University
Dan Li, Tsinghua University
Baojun Liu, Tsinghua University

References

Problem Types

CWE-405 Asymmetric Resource Consumption (Amplification) CWE
CWE-406 Insufficient Control of Network Message Volume (Network Amplification) CWE
CWE-770 Allocation of Resources Without Limits or Throttling CWE