Technitium DNS Server excessive DNSSEC requests
Summary
| CVE | CVE-2026-45557 |
|---|---|
| State | PUBLISHED |
| Assigner | cisa-cg |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-19 15:16:31 UTC |
| Updated | 2026-05-19 17:57:25 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 6.9 MEDIUM from 9119a7d8-5eab-497f-8521-727c672e3725
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
EPSS: 0.000480000 probability, percentile 0.150870000 (date 2026-05-26)
Problem Types: CWE-405 | CWE-406 | CWE-770 | CWE-405 CWE-405 Asymmetric Resource Consumption (Amplification) | CWE-406 CWE-406 Insufficient Control of Network Message Volume (Network Amplification) | CWE-770 CWE-770 Allocation of Resources Without Limits or Throttling
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | 9119a7d8-5eab-497f-8521-727c672e3725 | Secondary | 6.9 | MEDIUM | 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/C... |
| 4.0 | CNA | DECLARED | 6.9 | MEDIUM | 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 |
| 3.1 | 9119a7d8-5eab-497f-8521-727c672e3725 | Secondary | 5.8 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L |
| 3.1 | CNA | DECLARED | 5.8 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L |
CVSS v4.0 Breakdown
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
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Technitium | DNS Server | affected 15.0 custom | Not specified |
| CNA | Technitium | DNS Server | unaffected 15.0 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2025/va-26-138-02.json | 9119a7d8-5eab-497f-8521-727c672e3725 | raw.githubusercontent.com | |
| github.com/TechnitiumSoftware/DnsServer/blo/master/CHANGELOG.md | 9119a7d8-5eab-497f-8521-727c672e3725 | github.com | |
| www.cve.org/CVERecord | 9119a7d8-5eab-497f-8521-727c672e3725 | www.cve.org | |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Shuhan Zhang, Tsinghua University (en)
CNA: Dan Li, Tsinghua University (en)
CNA: Baojun Liu, Tsinghua University (en)