CVE-2025-47905: Request Smuggling (CVSS 5.4)

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.

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CVSS v3.1 Score

5.4

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Weakness Type (CWE)

CWE-444 CWE-444

References

Other References

https://varnish-cache.org/security/VSV00016.html http://www.openwall.com/lists/oss-security/2025/05/15/2 https://lists.debian.org/debian-lts-announce/2025/05/msg00040.html

Frequently Asked Questions

What is CVE-2025-47905? +

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. It has a CVSS v3.1 base score of 5.4 (MEDIUM).

How severe is CVE-2025-47905? +

CVE-2025-47905 has a CVSS v3.1 score of 5.4 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2025-47905? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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