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Fencer Intel
medium 5.4

CVE-2025-47905 json

Varnish Cache before 7.6.3 and 7.7 before 7.7.1, and Varnish Enterprise before 6.0.13r14, allow client-side desync via HTTP/1 requests, bec…

published last yr. modified 4mo ago also BIT-varnish-2025-47905 , EUVD-2025-14634

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

Varnish Cache before 7.6.3 and 7.7 before 7.7.1, and Varnish Enterprise before 6.0.13r14, allow client-side desync via HTTP/1 requests, because the product incorrectly permits CRLF to be skipped to delimit chunk boundaries.

Patch / fix

  • bitnami varnish 6.6.2
  • varnish-software Varnish Cache 6.0.14 LTS, 7.6.3, 7.7.1
  • varnish Debian 12 7.1.1-2+deb12u1
  • varnish Debian 13 7.7.0-2

debian advisories DEBIAN-CVE-2025-47905

  • varnish RHEL 10.0 7.6.1-2.el10_0.1
  • varnish RHEL 8 6.0.13-1.module+el8.10.0+23111+831cc069.1
  • varnish-modules RHEL 8 0.15.0-6.module+el8.10.0+21682+bcdd3a30
  • varnish RHEL 9 6.6.2-6.el9_6.1
  • varnish RHEL 9.2 EUS 6.6.2-3.el9_2.3
  • varnish RHEL 9.0 E4S 6.6.2-2.el9_0.4
  • varnish RHEL 9.4 EUS 6.6.2-5.el9_4.1
  • varnish RHEL 8.2 AUS 6.0.6-1.module+el8.2.0+23124+897a7786.1

red hat advisories RHSA-2025:8550RHSA-2025:8351RHSA-2025:8350RHSA-2025:8349RHSA-2025:8339RHSA-2025:8340

  • varnish AlmaLinux 10 7.6.1-2.el10_0.1
  • varnish AlmaLinux 8 6.0.13-1.module_el8.10.0+4003+9759c3c1.1
  • varnish-modules AlmaLinux 8 0.15.0-6.module_el8.9.0+3826+307eaba4
  • varnish AlmaLinux 9 6.6.2-6.el9_6.1

almalinux advisories ALSA-2025:8550ALSA-2025:8336ALSA-2025:8337

  • varnish Rocky Linux 9 6.6.2-6.el9_6.1
  • varnish Rocky Linux 10 7.6.1-2.el10_0.1
  • varnish Rocky Linux 8 6.0.13-1.module+el8.10.0+1982+334a201b.1
  • varnish Rocky Linux 8 6.0.13-1.module+el8.9.0+1777+0acf9965
  • varnish-modules Rocky Linux 8 0.15.0-6.module+el8.5.0+677+2a78a869

rocky linux advisories RLSA-2025:8337RLSA-2025:8550RLSA-2025:8336

  • varnish Alpine 3.21 7.6.3-r0
  • varnish Alpine 3.24, Alpine 3.23, Alpine 3.22 7.7.1-r0

alpine advisories ALPINE-CVE-2025-47905

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

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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-2025-47905 updated cvss 8.1

varnish: request smuggling attacks

  • Red Hat CodeReady Linux Builder EUS (v.9.2) varnish-devel 6.6.2-3.el9_2.3
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8351
  • Red Hat CodeReady Linux Builder EUS (v.9.4) varnish-devel 6.6.2-5.el9_4.1
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8349
  • Red Hat Enterprise Linux AppStream (v. 8) varnish 6.0.13-1.module+el8.10.0+23111+831cc069.1, varnish-modules 0.15.0-6.module+el8.10.0+21682+bcdd3a30
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8336
  • Red Hat Enterprise Linux AppStream (v. 9) varnish 6.6.2-6.el9_6.1
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8337
  • Red Hat Enterprise Linux AppStream (v. 10) varnish 7.6.1-2.el10_0.1
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8550
  • Red Hat Enterprise Linux AppStream AUS (v. 8.2) varnish 6.0.6-1.module+el8.2.0+23124+897a7786.1, varnish-modules 0.15.0-4.module+el8+2481+4078e9d2
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8339
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) varnish 6.0.6-2.module+el8.4.0+23123+54dbaab7.6, varnish-modules 0.15.0-5.module+el8.3.0+6843+b3b42fcc
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8340
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) varnish 6.0.8-2.module+el8.6.0+23122+0639db89.4, varnish-modules 0.15.0-6.module+el8.5.0+11976+0b4af72d
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8310
show 10 more
  • Red Hat Enterprise Linux AppStream E4S (v.8.4) varnish 6.0.6-2.module+el8.4.0+23123+54dbaab7.6, varnish-modules 0.15.0-5.module+el8.3.0+6843+b3b42fcc
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8340
  • Red Hat Enterprise Linux AppStream E4S (v.8.6) varnish 6.0.8-2.module+el8.6.0+23122+0639db89.4, varnish-modules 0.15.0-6.module+el8.5.0+11976+0b4af72d
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8310
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) varnish 6.6.2-2.el9_0.4
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8350
  • Red Hat Enterprise Linux AppStream EUS (v.8.8) varnish 6.0.8-3.module+el8.8.0+23121+d8c7990e.3, varnish-modules 0.15.0-6.module+el8.5.0+11976+0b4af72d
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8294
  • Red Hat Enterprise Linux AppStream EUS (v.9.2) varnish 6.6.2-3.el9_2.3
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8351
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) varnish 6.6.2-5.el9_4.1
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8349
  • Red Hat Enterprise Linux AppStream TUS (v.8.4) varnish 6.0.6-2.module+el8.4.0+23123+54dbaab7.6, varnish-modules 0.15.0-5.module+el8.3.0+6843+b3b42fcc
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8340
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) varnish 6.0.8-2.module+el8.6.0+23122+0639db89.4, varnish-modules 0.15.0-6.module+el8.5.0+11976+0b4af72d
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8310
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) varnish-devel 6.6.2-6.el9_6.1
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8337
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) varnish-devel 7.6.1-2.el10_0.1
    fixed: vendor fix “Currently, no mitigation is available for this vulnerability.” RHSA-2025:8550

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
last yr.

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-09).

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
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
<6.6.2
>=7.0.0
6.6.2

Affected products

  • varnish-software Varnish Cache

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests

References

Sources

Fencer Intel 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.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.