What is CVE-2025-30346?

CVE-2025-30346 is a medium-severity vulnerability in Varnish-software Varnish Cache, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.4/10. Published 2025-03-21.

How severe is CVE-2025-30346?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2025-30346 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Varnish-software Varnish Cache

CVE-2025-30346

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

Vulnerability class: HTTP Request Smuggling

EPSS: 0.004 (60.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N.

Affected products

Varnish-software Varnish Cache — versions 7.5.0

Weakness classification (CWE)

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

Public proof-of-concept exploits

w4zu/Debian_

References

varnish-cache.org/security/VSV00015.html

Frequently asked questions

What is CVE-2025-30346?: CVE-2025-30346 is a medium-severity vulnerability in Varnish-software Varnish Cache, classified under Inconsistent Interpretation of HTTP Requests (HTTP Request/Response Smuggling). CVSS score: 5.4/10. Published 2025-03-21.
How severe is CVE-2025-30346?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2025-30346 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.