Vulnerability Details : 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.
Products affected by CVE-2021-36740
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- Varnish-cache » Varnish Cache » Plus EditionVersions from including (>=) 6.0.0 and before (<) 6.0.8cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:plus:*:*:*
- 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:*:*:*
- Varnish-software » Varnish Cache » LTS EditionVersions from including (>=) 6.0.0 and up to, including, (<=) 6.0.7cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:lts:*:*:*
- Varnish-software » Varnish CacheVersions from including (>=) 6.0.0 and up to, including, (<=) 6.0.5cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:*
- Varnish Cache Project » Varnish CacheVersions from including (>=) 5.0.0 and up to, including, (<=) 5.2.1cpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*
- Varnish Cache Project » Varnish CacheVersions from including (>=) 6.1.0 and up to, including, (<=) 6.6.0cpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-36740
0.13%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 33 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-36740
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.4
|
MEDIUM | AV:N/AC:L/Au:N/C:P/I:P/A:N |
10.0
|
4.9
|
NIST | |
|
6.5
|
MEDIUM | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
3.9
|
2.5
|
NIST |
CWE ids for CVE-2021-36740
-
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.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-36740
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/THV2DQA2GS65HUCKK4KSD2XLN3AAQ2V5/
[SECURITY] Fedora 34 Update: varnish-6.5.2-1.fc34 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://docs.varnish-software.com/security/VSV00007/
Varnish HTTP/2 Request Smuggling - Varnish Software DocumentationMitigation;Vendor Advisory
-
https://github.com/varnishcache/varnish-cache/commit/82b0a629f60136e76112c6f2c6372cce77b683be
Take content length into account on H/2 request bodies · varnishcache/varnish-cache@82b0a62 · GitHubPatch;Third Party Advisory
-
https://github.com/varnishcache/varnish-cache/commit/9be22198e258d0e7a5c41f4291792214a29405cf
Take content length into account on H/2 request bodies · varnishcache/varnish-cache@9be2219 · GitHubPatch;Third Party Advisory
-
https://www.debian.org/security/2022/dsa-5088
Debian -- Security Information -- DSA-5088-1 varnishThird Party Advisory
-
https://varnish-cache.org/security/VSV00007.html
VSV00007 Varnish HTTP/2 Request Smuggling Attack — Varnish HTTP CacheMitigation;Vendor Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZHBNLDEOTGYRIEQZBWV7F6VPYS4O2AAK/
[SECURITY] Fedora 33 Update: varnish-6.4.0-5.fc33 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
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