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CVE-2021-36740

nvd nist
Published: Jul 14, 2021Modified: Jun 17, 2026

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6.5
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Exploitability: 3.9 / Impact: 2.5
Source: NVD

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.

Affected (11)

Show all products
Varnish Cache: Varnish Cache · Varnish Software: Varnish Cache · Varnish Cache Project: Varnish Cache · Fedoraproject: Fedora · Debian: Debian Linux
Varnish Cache
1 product
Varnish Cache
Varnish Software
1 product
Varnish Cache
Varnish Cache Project
1 product
Varnish Cache
Fedoraproject
1 product
Fedora
Debian
1 product
Debian Linux
Configuration A
7 vulnerable
Vulnerable SoftwareAffected Versions
Varnish Cache
Varnish Cache
6.0.0 ≤ version < 6.0.8
Varnish Cache
Version 6.0.8 r1
Varnish Cache
Version 6.0.8 r2
Varnish Software
Varnish Cache
6.0.0 ≤ version ≤ 6.0.5
Varnish Cache
6.0.0 ≤ version ≤ 6.0.7
Varnish Cache
5.0.0 ≤ version ≤ 5.2.1
Varnish Cache
6.1.0 ≤ version ≤ 6.6.0
Configuration B
2 vulnerable
Vulnerable SoftwareAffected Versions
Fedoraproject
Fedora
Version 33
Fedora
Version 34
Configuration C
2 vulnerable
Vulnerable SoftwareAffected Versions
Debian
Debian Linux
Version 10.0
Debian Linux
Version 11.0

Related CWEs

CWE-444
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

References (14)

Source: cve@mitre.org
MitigationVendor Advisory
Source: cve@mitre.org
PatchThird Party Advisory
Source: cve@mitre.org
PatchThird Party Advisory
Source: cve@mitre.org
Source: cve@mitre.org
Source: cve@mitre.org
MitigationVendor Advisory
Source: cve@mitre.org
Third Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
MitigationVendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
PatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
PatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Source: af854a3a-2127-422b-91ae-364da2661108
Source: af854a3a-2127-422b-91ae-364da2661108
MitigationVendor Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory

Timeline

No history available yet.