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CVE-2025-30187— Denial of service via crafted DoH exchange in PowerDNS DNSdist

Quick assessment

Affected
PowerDNS DNSdist
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.

DNSdist是DNSdist开源的一款高度感知 DNS、DoS 和滥用的负载均衡器。 DNSdist存在安全漏洞，该漏洞源于使用nghttp2库处理DNS over HTTPS查询时可能触发无限I/O读取循环，可能导致CPU资源过度消耗和拒绝服务攻击。

CVSS 3.7 · Low EPSS 0.29% · P19

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-30187

Vulnerability Information
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Vulnerability Title
Denial of service via crafted DoH exchange in PowerDNS DNSdist
Source: CVE Program / CVE List V5
Vulnerability Description
In some circumstances, when DNSdist is configured to use the nghttp2 library to process incoming DNS over HTTPS queries, an attacker might be able to cause a denial of service by crafting a DoH exchange that triggers an unbounded I/O read loop, causing an unexpected consumption of CPU resources.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5
Vulnerability Title
DNSdist 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DNSdist是DNSdist开源的一款高度感知 DNS、DoS 和滥用的负载均衡器。 DNSdist存在安全漏洞，该漏洞源于使用nghttp2库处理DNS over HTTPS查询时可能触发无限I/O读取循环，可能导致CPU资源过度消耗和拒绝服务攻击。
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
PowerDNS DNSdist 1.9.0 ~ 1.9.11 -

II. Public POCs for CVE-2025-30187

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III. Intelligence Information for CVE-2025-30187

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IV. Related Vulnerabilities

Same product: DNSdist
Same vendor: PowerDNS
Same weakness: CWE-835

V. Comments for CVE-2025-30187

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