CVE-2025-30346

varnish: Client-Side Desynchronization in Varnish Cache

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Severity

Moderate

Red Hat Product Security

5.4

CVSS 3.1

Review impact separately from score.

Published · March 21, 2025

Updated · June 30, 2026

Description

A flaw was found in Varnish Cache and Varnish Enterprise. This vulnerability allows client-side desynchronization via crafted HTTP/1 requests.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

CVSS / CWE

CVSS 3.1 · 5.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')