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Vulnerability · Published Jul 14, 2021 · Assigned by mitre

CVE-2021-36740

Medium 6.5

In plain English

A medium-severity security flaw in the varnish package (Alpine). There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)1.6%top 24.1% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20varnish6.6.1-r0ALPINE-CVE-2021-36740
Alpine:v3.21varnish6.6.1-r0ALPINE-CVE-2021-36740
Alpine:v3.22varnish6.6.1-r0ALPINE-CVE-2021-36740
Alpine:v3.23varnish6.6.1-r0ALPINE-CVE-2021-36740
Alpine:v3.24varnish6.6.1-r0ALPINE-CVE-2021-36740
Debian:12varnish6.5.2-1DEBIAN-CVE-2021-36740
Debian:13varnish6.5.2-1DEBIAN-CVE-2021-36740
Rocky Linux:8varnish0:6.0.6-2.module+el8.3.0+179+20b582ccRLSA-2021:2988
Rocky Linux:8varnish-modules0:0.15.0-5.module+el8.3.0+179+20b582ccRLSA-2021:2988
Ubuntu:22.04:LTSvarnish6.6.1-1ubuntu0.2USN-5474-1

Affected products (as reported)

VendorProductVersions
n/a n/a n/a

References