Medium severity5.8NVD Advisory· Published May 19, 2026· Updated May 19, 2026

CVE-2026-45557

Description

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.

Affected products

Technitium/Dnsserverreferences2 versions
(expand)+ 1 more
- (no CPE)
- (no CPE)range: <15.0

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

News mentions

No linked articles in our index yet.

Severity

MediumCVSS v3.1

5.8/ 10

CVSS v46.9

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
Complexity: Low
Privileges: None
User interaction: None
Scope: Changed
Confidentiality: None
Integrity: None
Availability: Low

Vector

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

EPSS

Probability of exploitation in the next 30 days.

0.04%

VYPR risk score

Composite of severity, exploitation, and reach.

0.38medium

cvss	0.377
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000

Weaknesses

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

CVE ID

CVE-2026-45557

Source code

github.com/TechnitiumSoftware/DnsServer/blo/master/CHANGELOG.md