CVE-2021-36740
varnish - security update
6.5
MEDIUM
CVSS 3.1
EPSS 0.96%
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.
How to fix CVE-2021-36740
To remediate CVE-2021-36740, upgrade the affected package to a fixed version below.
- —upgrade to 6.5.2-r0 or later
- —upgrade to 5.2.2 or later
- —upgrade to 6.5.1-1+deb11u2 or later
- —upgrade to 6.1.1-1+deb10u3 or later
Is CVE-2021-36740 being exploited?
Low — EPSS is 1.0%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 6.5.2-r0
- >= 5.0.0, < 5.2.2, >= 6.1.0, < 6.6.1
- from 0, < 6.5.1-1+deb11u2
- from 0, < 6.1.1-1+deb10u3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |