What is the CVSS score of CVE-2025-30346?

CVE-2025-30346 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.2%.

Which versions of Varnish Enterprise are affected by CVE-2025-30346?

CVE-2025-30346 presents moderate security risk rated CVSS 5.4. Exploitation could compromise the security of affected deployments.. A patch is available.

How to fix or mitigate CVE-2025-30346?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Varnish Enterprise CVE-2025-30346

MEDIUM

HTTP Request/Response Smuggling (CWE-444)

2025-03-21 cve@mitre.org

Information Disclosure Request Smuggling Varnish Enterprise Varnish Cache Red Hat Suse

5.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.4 MEDIUM

AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

SUSE

MEDIUM

qualitative

Red Hat

5.4 MEDIUM

qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch released

Apr 05, 2026 - 20:30 nvd

Patch available

Analysis Generated

Mar 28, 2026 - 18:32 vuln.today

CVE Published

Mar 21, 2025 - 07:15 nvd

MEDIUM 5.4

DescriptionCVE.org

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

AnalysisAI

Varnish Cache before 7.6.2 and Varnish Enterprise before 6.0.13r10 allow client-side desync via HTTP/1 requests. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, no authentication required. No vendor patch available.

Technical ContextAI

This vulnerability is classified as HTTP Request/Response Smuggling (CWE-444), which allows attackers to manipulate HTTP request interpretation between frontend and backend servers. Varnish Cache before 7.6.2 and Varnish Enterprise before 6.0.13r10 allow client-side desync via HTTP/1 requests. Affected products include: Varnish-Software Varnish Enterprise, Varnish Cache Project Varnish Cache. Version information: before 7.6.2.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Enforce strict HTTP parsing, normalize requests at proxy layer, use HTTP/2 end-to-end, reject ambiguous headers.