Varnish Cache before 7.6.2 and Varnish Enterprise before 6.0.13r10 allow client-side desync via HTTP/1 requests.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-005275 advisory.

    Varnish Cache before 7.6.2 and Varnish Enterprise before 6.0.13r10 allow client-side desync via HTTP/1     requests.

Tenable has extracted the preceding description block directly from the Unity Linux 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 Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Varnish Cache before 7.6.2 and Varnish Enterprise before 6.0.13r10 allow client-side desync via HTTP/1     requests. (CVE-2025-30346)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2025:0276 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2025-30346:
    Varnish Cache before 7.6.2 and Varnish Enterprise before 6.0.13r10 allow client-side desync via HTTP/1     requests.

Tenable has extracted the preceding description block directly from the Tencent Linux 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 Fedora 41 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2025-4453f596a8 advisory.

    Security: This update includes fix for VSV00015 aka CVE-2025-30346. Upstream considers this a low risk     problem. For details, refer to https://varnish-cache.org/security/VSV00015.html


Tenable has extracted the preceding description block directly from the Fedora 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 Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4101 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4101-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/                          Adrian Bunk     March 31, 2025                                https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : varnish     Version        : 6.5.1-1+deb11u4     CVE ID         : CVE-2025-30346

    A HTTP/1 client-side desync vulnerability has been fixed in Varnish,     a caching HTTP reverse proxy.

    For Debian 11 bullseye, this problem has been fixed in version     6.5.1-1+deb11u4.

    We recommend that you upgrade your varnish packages.

    For the detailed security status of varnish please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/varnish

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian 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 version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 26f6733d-06a9-11f0-ba0b-641c67a117d8 advisory.

    The Varnish Development Team reports:
    A client-side desync vulnerability can be triggered in Varnish Cache                and Varnish Enterprise. This vulnerability can be triggered under                specific circumstances involving malformed HTTP/1 requests.

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

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

ID	Name	Product	Family	Severity
298184	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: varnish (UTSA-2026-005275)	Nessus	Unity Linux Local Security Checks	medium
251920	Linux Distros Unpatched Vulnerability : CVE-2025-30346	Nessus	Misc.	medium
238509	TencentOS Server 4: varnish (TSSA-2025:0276)	Nessus	Tencent Local Security Checks	medium
233883	Fedora 41 : varnish (2025-4453f596a8)	Nessus	Fedora Local Security Checks	medium
233596	Debian dla-4101 : libvarnishapi-dev - security update	Nessus	Debian Local Security Checks	medium
233280	FreeBSD : www/varnish7 -- client-side desync vulnerability (26f6733d-06a9-11f0-ba0b-641c67a117d8)	Nessus	FreeBSD Local Security Checks	medium

Detections

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CVE-2025-30346

medium

Tenable Plugins

medium

medium

medium

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medium

medium