Detections
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Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : DNSdist vulnerabilities (USN-8037-1)

high Nessus Plugin ID 299040

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8037-1 advisory.

 It was discovered that HTTP/2, which is used/vendored by DNSdist, did not properly account for resources when handling client-triggered stream

 resets. An attacker could possibly use this issue to cause a

 denial of service. (CVE-2025-8671)

 It was discovered that DNSdist did not properly manage memory limits when handling an unlimited number of queries on a single TCP connection. An

 attacker could possibly use this issue to cause a denial of service. (CVE-2025-30193)

 It was discovered that DNSdist, when configured with the nghttp2 library, did not correctly process certain DNS over HTTPS queries. An attacker could possibly use this cause a denial of service.
 (CVE-2025-30187)

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

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

Solution

Update the affected dnsdist package.

See Also

https://ubuntu.com/security/notices/USN-8037-1

Plugin Details

Severity: High

ID: 299040

File Name: ubuntu_USN-8037-1.nasl

Version: 1.1

Type: local

Agent: unix

Published: 2/14/2026

Updated: 2/14/2026

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2025-30193

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

CVSS Score Source: CVE-2025-8671

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:dnsdist, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:25.10, cpe:/o:canonical:ubuntu_linux:24.04:-:lts

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2/12/2026

Vulnerability Publication Date: 5/20/2025

Reference Information

CVE: CVE-2025-30187, CVE-2025-30193, CVE-2025-8671

USN: 8037-1