5.4

CVE-2025-47905: varnish-software varnish_cache HTTP Request/Response Smuggling

CVSS: 5.4v3.1MediumDeferred
AliasesALPINE-CVE-2025-47905RHSA-2025:8294RHSA-2025:8310
Published 13-05-2025Last modified 29-05-2025
Open JSON

Vulnerability summary

CVE-2025-47905 is a medium (CVSS 5.4) HTTP Request/Response Smuggling vulnerability in varnish-software varnish_cache. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.37%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
DSA-5918-1

Timeline

  1. 13-05-2025
    PublishedVulnerability first disclosed.
  2. 29-05-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

29%

Versus all other CVEs

30-day change

+0.01 pp

From 0.36% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat6 products
  • varnish< 0:6.0.8-3.module+el8.8.0+23121+d8c7990e.3 | < 0:6.0.8-2.module+el8.6.0+23122+0639db89.4 | < 0:6.0.13-1.module+el8.10.0+23111+831cc069.1 | < 0:6.6.2-6.el9_6.1 | < 0:6.0.6-1.module+el8.2.0+23124+897a7786.1 | < 0:6.0.6-2.module+el8.4.0+23123+54dbaab7.6 | < 0:6.6.2-5.el9_4.1 | < 0:6.6.2-2.el9_0.4 | < 0:6.6.2-3.el9_2.3 | < 0:7.6.1-2.el10_0.1
  • varnish-devel< 0:6.0.8-3.module+el8.8.0+23121+d8c7990e.3 | < 0:6.0.8-2.module+el8.6.0+23122+0639db89.4 | < 0:6.0.13-1.module+el8.10.0+23111+831cc069.1 | < 0:6.6.2-6.el9_6.1 | < 0:6.0.6-1.module+el8.2.0+23124+897a7786.1 | < 0:6.0.6-2.module+el8.4.0+23123+54dbaab7.6 | < 0:6.6.2-5.el9_4.1 | < 0:6.6.2-3.el9_2.3 | < 0:7.6.1-2.el10_0.1
  • varnish-docs< 0:6.0.8-3.module+el8.8.0+23121+d8c7990e.3 | < 0:6.0.8-2.module+el8.6.0+23122+0639db89.4 | < 0:6.0.13-1.module+el8.10.0+23111+831cc069.1 | < 0:6.6.2-6.el9_6.1 | < 0:6.0.6-1.module+el8.2.0+23124+897a7786.1 | < 0:6.0.6-2.module+el8.4.0+23123+54dbaab7.6 | < 0:6.6.2-5.el9_4.1 | < 0:6.6.2-2.el9_0.4 | < 0:6.6.2-3.el9_2.3 | < 0:7.6.1-2.el10_0.1
  • varnish-modules< 0:0.15.0-6.module+el8.5.0+11976+0b4af72d | < 0:0.15.0-6.module+el8.10.0+21682+bcdd3a30 | < 0:0.15.0-4.module+el8+2481+4078e9d2 | < 0:0.15.0-5.module+el8.3.0+6843+b3b42fcc
  • varnish-modules-debuginfo< 0:0.15.0-6.module+el8.5.0+11976+0b4af72d | < 0:0.15.0-6.module+el8.10.0+21682+bcdd3a30 | < 0:0.15.0-4.module+el8+2481+4078e9d2 | < 0:0.15.0-5.module+el8.3.0+6843+b3b42fcc
Alpine1 product
  • varnish< 7.6.3-r0 | < 7.7.1-r0
Debian1 product
  • varnish< 7.1.1-2+deb12u1 | < 7.7.0-2 | < 6.5.1-1+deb11u5
Ubuntu1 product
  • varnishAll versions (No fix recorded)
Varnish-software1 product
  • varnish_cache< 6.0.14 LTS | ≥ 7.0.0, < 7.6.3 | ≥ 7.7.0, < 7.7.1

5 vendors · 10 products

References

35 links
Show all 35 references