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Servers and applications

CVE-2021-36740

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.

Severity
Medium 6.5
Published
14 Jul 2021
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Sources
NVD

Affected software

SoftwareAffected versions
Varnish CacheServers and applications · cpe:a:varnish-software:varnish_cache
  • From 6.0.0 up to 6.0.5
  • From 6.0.0 up to 6.0.7
Varnish CacheServers and applications · cpe:a:varnish_cache_project:varnish_cache
  • From 5.0.0 up to 5.2.1
  • From 6.1.0 up to 6.6.0

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2021-36740
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2021-36740