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Fencer Vulns
medium 5.4

CVE-2025-30346 json

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

published 2025-03-21 19 mo ago modified 2026-09-10 59 d ago also BIT-varnish-2025-30346 , EUVD-2025-7260

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 24%
public exploits
0
none known

Summary

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

Patch / fix

  • varnish-software Varnish Cache 7.6.2
  • varnish Debian 12 7.1.1-2+deb12u1
  • varnish Debian 13 7.7.0-1

debian advisories DEBIAN-CVE-2025-30346

  • varnish openSUSE Leap 16.0 7.7.3-bp160.1.1
  • vinyl-cache openSUSE Tumbleweed 9.0.0-1.1
  • varnish openSUSE Tumbleweed 7.7.0-1.1

opensuse advisories openSUSE-SU-2026:22131-1openSUSE-SU-2026:10751-1openSUSE-SU-2025:14992-1

  • varnish Alpine 3.21 7.6.3-r0
  • varnish Alpine 3.24, Alpine 3.23, Alpine 3.22 7.7.0-r0

alpine advisories ALPINE-CVE-2025-30346

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-30346 updated cvss 5.4

varnish: Client-Side Desynchronization in Varnish Cache

  • Red Hat Enterprise Linux 10 varnish
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Enterprise Linux 8 varnish, varnish-modules Red Hat Enterprise Linux 9 varnish
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 24% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
NVD 3.1 4.8 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
OSV 3.1 5.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
bitnami varnish
all versions
 no fix listed

Affected products

  • varnish-software Varnish Cache

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.