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CVE-2025-47905

Good to know:

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Date: May 12, 2025

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.

Severity Score

Related Resources (5)

http://www.openwall.com/lists/oss-security/2025/05/15/2
https://lists.debian.org/debian-lts-announce/2025/05/msg00040.html
https://nvd.nist.gov/vuln/detail/CVE-2025-47905
https://varnish-cache.org/security/VSV00016.html
https://www.mend.io/vulnerability-database/CVE-2025-47905

Severity Score

Weakness Type (CWE)

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CWE-444

Top Fix

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Upgrade Version

Upgrade to version https://github.com/varnishcache/varnish-cache.git - varnish-7.7.1;https://github.com/varnishcache/varnish-cache.git - varnish-7.6.3;https://github.com/varnishcache/varnish-cache.git - varnish-6.0.14

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): NONE

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