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.

The remote SUSE Linux SLES15 host has a package installed that is affected by a vulnerability as referenced in the SUSE- SU-2025:01792-1 advisory.

    - CVE-2025-30193: stack exhaustion when processing too many queries on incoming TCP connections leads to a       denial-of-service (bsc#1243378).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2025:01745-1 advisory.

    - CVE-2025-30193: stack exhaustion when processing too many queries on incoming TCP connections leads to a       denial-of-service (bsc#1243378).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2025:01743-1 advisory.

    Update to version 1.9.10.

    - CVE-2025-30194: illegal memory access (double-free) when processing specially crafted DoH exchanges     leads to a       denial-of-service (bsc#1242028).
    - CVE-2025-30193: stack exhaustion when processing too many queries on incoming TCP connections leads to a       denial-of-service (bsc#1243378).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 41 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2025-0c238cf731 advisory.

    Updated to 1.9.10, this fixes CVE-2025-30193: Denial of service via crafted TCP exchange

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
237695	SUSE SLES15 Security Update : dnsdist (SUSE-SU-2025:01792-1)	Nessus	SuSE Local Security Checks	high
237547	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : dnsdist (SUSE-SU-2025:01745-1)	Nessus	SuSE Local Security Checks	high
237540	SUSE SLED15 / SLES15 Security Update : dnsdist (SUSE-SU-2025:01743-1)	Nessus	SuSE Local Security Checks	high
237524	Fedora 41 : dnsdist (2025-0c238cf731)	Nessus	Fedora Local Security Checks	high

Detections

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CVE-2025-30193

high

Tenable Plugins

high

high

high

high