Bug 2367460 (CVE-2025-30193) - CVE-2025-30193 dnsdist: Denial of service via crafted TCP exchange
Summary: CVE-2025-30193 dnsdist: Denial of service via crafted TCP exchange
Keywords:
Status: NEW
Alias: CVE-2025-30193
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2367560 2367561 2367562
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-05-20 12:01 UTC by OSIDB Bzimport
Modified: 2025-05-20 16:42 UTC (History)
0 users

Fixed In Version:
Clone Of:
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Last Closed:
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Description OSIDB Bzimport 2025-05-20 12:01:04 UTC 
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.
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