CVE-2021-36740
high
CVSS v3
—
CVSS v2
—
VIR risk
8.0
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.
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-36740
Vendor advisory: rocky — https://errata.rockylinux.org/RLSA-2021:2988
Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-36740.html
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| sles | affected | | |
| rocky | 8 | fixed | |
| debian | bookworm | fixed | 6.5.2-1 |
| debian | bullseye | fixed | 6.5.1-1+deb11u2 |
| debian | forky | fixed | 6.5.2-1 |
| debian | sid | fixed | 6.5.2-1 |
| debian | trixie | fixed | 6.5.2-1 |
References
Verify integrity in audit chain (admin only). AS-IS.