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CVE-2026-45557— Technitium DNS Server excessive DNSSEC requests

Quick assessment

Affected
Technitium DNS Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Technitium DNS Server是Technitium团队的一个开源的权威和递归 DNS 服务器。可用于自托管 DNS 服务器以保护隐私和安全。 Technitium DNS Server 15.0之前版本存在安全漏洞，该漏洞源于主动尝试获取缺失的RRSIG记录或错配的DNSKEY记录，攻击者控制域可导致系统生成过多网络流量。

CVSS 5.8 · Medium EPSS 0.51% · P41

Affected Version Matrix 2

VendorProduct Version RangeStatus
Technitium DNS Server < 15.0 affected
15.0 unaffected
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I. Basic Information for CVE-2026-45557

Vulnerability Information
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Vulnerability Title
Technitium DNS Server excessive DNSSEC requests
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不对称的资源消耗(放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Technitium DNS Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Technitium DNS Server是Technitium团队的一个开源的权威和递归 DNS 服务器。可用于自托管 DNS 服务器以保护隐私和安全。 Technitium DNS Server 15.0之前版本存在安全漏洞，该漏洞源于主动尝试获取缺失的RRSIG记录或错配的DNSKEY记录，攻击者控制域可导致系统生成过多网络流量。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Technitium DNS Server 0 ~ 15.0 -

II. Public POCs for CVE-2026-45557

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III. Intelligence Information for CVE-2026-45557

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Vendor Advisories for CVE-2026-45557 (2)

Vendor Pages for CVE-2026-45557 (1)

IV. Related Vulnerabilities

Same product: DNS Server
Same vendor: Technitium
Same weakness: CWE-405

V. Comments for CVE-2026-45557

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