CVE-2021-36740

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CVSS 3.1

6.5 medium

EPSS

2%p74

Published

Jul 14, 2021 (Jul 14, 2021)

Modified

Jun 17, 2026

Description

Varnish Cache, with HTTP/2 enabled, allows request smuggling and VCL authorization bypass via a large Content-Length header for a POST request. This affects Varnish Enterprise 6.0.x before 6.0.8r3, and Varnish Cache 5.x and 6.x before 6.5.2, 6.6.x before 6.6.1, and 6.0 LTS before 6.0.8.

Vendors: varnish-cache varnish-software varnish cache project fedoraproject debian
Products: varnish cache, fedora, debian linux
Weakness: CWE-444
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (1.6%)

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