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CVE-2025-30193— Denial of service via crafted TCP exchange

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TCP连接查询限制不当，可能导致拒绝服务攻击。

CVSS 7.5 · High EPSS 0.61% · P48

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-30193

Vulnerability Information
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Vulnerability Title
Denial of service via crafted TCP exchange
Source: CVE Program / CVE List V5
Vulnerability Description
In some circumstances, when DNSdist is configured to allow an unlimited number of queries on a single, incoming TCP connection from a client, an attacker can cause a denial of service by crafting a TCP exchange that triggers an exhaustion of the stack and a crash of DNSdist, causing a denial of service. The remedy is: upgrade to the patched 1.9.10 version. A workaround is to restrict the maximum number of queries on incoming TCP connections to a safe value, like 50, via the setMaxTCPQueriesPerConnection setting. We would like to thank Renaud Allard for bringing this issue to our attention.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
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TCP连接查询限制不当，可能导致拒绝服务攻击。
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 1.9.10 -

II. Public POCs for CVE-2025-30193

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III. Intelligence Information for CVE-2025-30193

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Vendor Advisories for CVE-2025-30193 (1)

IV. Related Vulnerabilities

Same product: DNSdist
Same vendor: PowerDNS
Same weakness: CWE-674

V. Comments for CVE-2025-30193

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