CVE-2021-36740
Varnish Cache HTTP/2 Request Smuggling and Authorization Bypass
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.
INFO
Published Date :
July 14, 2021, 5:15 p.m.
Last Modified :
Nov. 7, 2023, 3:36 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.5
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-36740 has a 10 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-36740
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-36740.
| URL | Resource |
|---|---|
| https://docs.varnish-software.com/security/VSV00007/ | Mitigation Vendor Advisory |
| https://github.com/varnishcache/varnish-cache/commit/82b0a629f60136e76112c6f2c6372cce77b683be | Patch Third Party Advisory |
| https://github.com/varnishcache/varnish-cache/commit/9be22198e258d0e7a5c41f4291792214a29405cf | Patch Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/THV2DQA2GS65HUCKK4KSD2XLN3AAQ2V5/ | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZHBNLDEOTGYRIEQZBWV7F6VPYS4O2AAK/ | |
| https://varnish-cache.org/security/VSV00007.html | Mitigation Vendor Advisory |
| https://www.debian.org/security/2022/dsa-5088 | Third Party Advisory |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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Java
A web challenge for CNSS Recruit 2022(CTF).
Shell Dockerfile C JavaScript CSS EJS VCL Python
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Shell VCL Dockerfile
Awesome Vulnerable Applications
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-36740 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-36740 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZHBNLDEOTGYRIEQZBWV7F6VPYS4O2AAK/ [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/THV2DQA2GS65HUCKK4KSD2XLN3AAQ2V5/ [No types assigned] Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/ZHBNLDEOTGYRIEQZBWV7F6VPYS4O2AAK/ Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/THV2DQA2GS65HUCKK4KSD2XLN3AAQ2V5/ -
CPE Deprecation Remap by [email protected]
Aug. 02, 2022
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:*:*:*:* versions from (including) 6.0.0 from (including) 6.0.5 OR *cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:* versions from (including) 6.0.0 from (including) 6.0.5 -
CPE Deprecation Remap by [email protected]
Aug. 02, 2022
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:varnish-cache:varnish_cache:6.0.8:r2:*:*:plus:*:*:* OR *cpe:2.3:a:varnish-software:varnish_cache_plus:6.0.8:r2:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
Aug. 02, 2022
Action Type Old Value New Value Removed CPE Configuration OR *cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:plus:*:*:* versions from (including) 6.0.0 from (excluding) 6.0.8 -
CPE Deprecation Remap by [email protected]
Aug. 02, 2022
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:varnish-cache:varnish_cache:6.0.8:r1:*:*:plus:*:*:* OR *cpe:2.3:a:varnish-software:varnish_cache_plus:6.0.8:r1:*:*:*:*:*:* -
CPE Deprecation Remap by [email protected]
Aug. 02, 2022
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:lts:*:*:* versions from (including) 6.0.0 from (including) 6.0.7 OR *cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:lts:*:*:* versions from (including) 6.0.0 from (including) 6.0.7 -
CPE Deprecation Remap by [email protected]
Aug. 02, 2022
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:*:*:*:* versions from (including) 6.1.0 from (including) 6.6.0 OR *cpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:* versions from (including) 6.1.0 from (including) 6.6.0 -
CPE Deprecation Remap by [email protected]
Aug. 02, 2022
Action Type Old Value New Value Changed CPE Configuration OR *cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:*:*:*:* versions from (including) 5.0.0 from (including) 5.2.1 OR *cpe:2.3:a:varnish_cache_project:varnish_cache:*:*:*:*:*:*:*:* versions from (including) 5.0.0 from (including) 5.2.1 -
Modified Analysis by [email protected]
May. 15, 2022
Action Type Old Value New Value Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/THV2DQA2GS65HUCKK4KSD2XLN3AAQ2V5/ Third Party Advisory https://lists.fedoraproject.org/archives/list/[email protected]/message/THV2DQA2GS65HUCKK4KSD2XLN3AAQ2V5/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/ZHBNLDEOTGYRIEQZBWV7F6VPYS4O2AAK/ Third Party Advisory https://lists.fedoraproject.org/archives/list/[email protected]/message/ZHBNLDEOTGYRIEQZBWV7F6VPYS4O2AAK/ Mailing List, Third Party Advisory Changed Reference Type https://www.debian.org/security/2022/dsa-5088 No Types Assigned https://www.debian.org/security/2022/dsa-5088 Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Mar. 04, 2022
Action Type Old Value New Value Added Reference https://www.debian.org/security/2022/dsa-5088 [No Types Assigned] -
Initial Analysis by [email protected]
Aug. 05, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:P/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Changed Reference Type https://docs.varnish-software.com/security/VSV00007/ No Types Assigned https://docs.varnish-software.com/security/VSV00007/ Mitigation, Vendor Advisory Changed Reference Type https://github.com/varnishcache/varnish-cache/commit/82b0a629f60136e76112c6f2c6372cce77b683be No Types Assigned https://github.com/varnishcache/varnish-cache/commit/82b0a629f60136e76112c6f2c6372cce77b683be Patch, Third Party Advisory Changed Reference Type https://github.com/varnishcache/varnish-cache/commit/9be22198e258d0e7a5c41f4291792214a29405cf No Types Assigned https://github.com/varnishcache/varnish-cache/commit/9be22198e258d0e7a5c41f4291792214a29405cf Patch, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/THV2DQA2GS65HUCKK4KSD2XLN3AAQ2V5/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/THV2DQA2GS65HUCKK4KSD2XLN3AAQ2V5/ Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/ZHBNLDEOTGYRIEQZBWV7F6VPYS4O2AAK/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/ZHBNLDEOTGYRIEQZBWV7F6VPYS4O2AAK/ Third Party Advisory Changed Reference Type https://varnish-cache.org/security/VSV00007.html No Types Assigned https://varnish-cache.org/security/VSV00007.html Mitigation, Vendor Advisory Added CWE NIST CWE-444 Added CPE Configuration OR *cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:*:*:*:* versions from (including) 5.0.0 up to (including) 5.2.1 *cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:*:*:*:* versions from (including) 6.0.0 up to (including) 6.0.5 *cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:lts:*:*:* versions from (including) 6.0.0 up to (including) 6.0.7 *cpe:2.3:a:varnish-cache:varnish_cache:*:*:*:*:plus:*:*:* versions from (including) 6.0.0 up to (excluding) 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:varnish_cache:*:*:*:*:*:*:*:* versions from (including) 6.1.0 up to (including) 6.6.0 Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Jul. 25, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/ZHBNLDEOTGYRIEQZBWV7F6VPYS4O2AAK/ [No Types Assigned] Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/THV2DQA2GS65HUCKK4KSD2XLN3AAQ2V5/ [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-36740 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-36740
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.67 }} 0.20%
score
0.79811
percentile