Medium severity6.5NVD Advisory· Published Jul 14, 2021· Updated Jun 17, 2026
CVE-2021-36740
CVE-2021-36740
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
16cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:plus:*:*:*+ 3 more
- cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:plus:*:*:*range: >=6.0.0,<6.0.8
- cpe:2.3:a:varnish-cache:varnish_cache:6.0.8:r1:*:*:plus:*:*:*
- cpe:2.3:a:varnish-cache:varnish_cache:6.0.8:r2:*:*:plus:*:*:*
- cpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*range: >=5.0.0,<=5.2.1
cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:*range: >=6.0.0,<=6.0.5
- cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:lts:*:*:*range: >=6.0.0,<=6.0.7
- (no CPE)range: <6.5.2, <6.6.1, <6.0.8 LTS, <6.0.8r3
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- Varnish/Varnish Cachedescription
- Range: <6.0.8r3
- osv-coords3 versionspkg:bitnami/varnishpkg:rpm/opensuse/varnish&distro=openSUSE%20Leap%2015.3pkg:rpm/suse/varnish&distro=SUSE%20Package%20Hub%2015%20SP3
>= 5.0.0, < 5.2.2+ 2 more
- (no CPE)range: >= 5.0.0, < 5.2.2
- (no CPE)range: < 7.1.0-bp153.2.3.1
- (no CPE)range: < 7.1.0-bp153.2.3.1
Patches
Vulnerability mechanics
References
7- github.com/varnishcache/varnish-cache/commit/82b0a629f60136e76112c6f2c6372cce77b683benvdPatchThird Party Advisory
- github.com/varnishcache/varnish-cache/commit/9be22198e258d0e7a5c41f4291792214a29405cfnvdPatchThird Party Advisory
- docs.varnish-software.com/security/VSV00007/nvdMitigationVendor Advisory
- varnish-cache.org/security/VSV00007.htmlnvdMitigationVendor Advisory
- www.debian.org/security/2022/dsa-5088nvdThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/THV2DQA2GS65HUCKK4KSD2XLN3AAQ2V5/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZHBNLDEOTGYRIEQZBWV7F6VPYS4O2AAK/nvd
News mentions
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