CVE-2025-47905

MEDIUM

5.4

CVSS Score

Published: May 13, 2025 at 12:00 AM UTC

Updated: June 17, 2026 at 09:28 AM UTC

1 product affected across 1 vendorVarnish Cache

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Severity

MEDIUM5.4

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Varnish Cache · Varnish Software

95%

v < 6.0.14 LTS7.0.0 ≤ v < 7.6.37.7.0 ≤ v < 7.7.17.0.0 7.7.0

Affected range stops below 6.0.14 LTS, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.6.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.7.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

Source: [email protected]

https://varnish-cache.org/security/VSV00016.html

Source: af854a3a-2127-422b-91ae-364da2661108

http://www.openwall.com/lists/oss-security/2025/05/15/2

Source: af854a3a-2127-422b-91ae-364da2661108

https://lists.debian.org/debian-lts-announce/2025/05/msg00040.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.4MEDIUMmitre

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-444

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