Is CVE-2021-36740 actively exploited?

CVE-2021-36740 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-36740?

CVE-2021-36740 has a CVSS score of 6.5 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.

How do I patch CVE-2021-36740?

Patch guidance is available from varnish-cache security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-36740.

CVE-2021-36740 - remediation guidance & executive summary

Q: Which products are affected by CVE-2021-36740?

11 products: varnish-cache varnish cache, varnish-cache varnish cache, varnish-cache varnish cache, varnish-software varnish cache, varnish-software varnish cache, and 6 more.

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.

CVSS Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: low
Integrity: low
Availability: none
Weaknesses: CWE-444

Metadata

Primary Vendor: VARNISH-CACHE
Published: 7/14/2021
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

varnish-cache : varnish_cachevarnish-cache : varnish_cachevarnish-cache : varnish_cachevarnish-software : varnish_cachevarnish-software : varnish_cachevarnish_cache_project : varnish_cachevarnish_cache_project : varnish_cachefedoraproject : fedorafedoraproject : fedoradebian : debian_linuxdebian : debian_linux

Remediation Guidance

Executive Summary

View on NIST NVD