CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS
Percentile
79.9%
Severity: Medium
Date : 2021-07-14
CVE-ID : CVE-2021-36740
Package : varnish
Type : url request injection
Remote : Yes
Link : https://security.archlinux.org/AVG-2154
The package varnish before version 6.6.1-1 is vulnerable to url request
injection.
Upgrade to 6.6.1-1.
The problem has been fixed upstream in version 6.6.1.
The issue can be mitigated by turning off support for HTTP/2, using
sudo varnishadm param.set feature -http2
or by preventing connection reuse with the following configuration:
sub vcl_backend_fetch {
set bereq.http.Connection = “close”;
}
Varnish Cache before version 6.6.1, with HTTP/2 enabled, allows request
smuggling and VCL authorization bypass via a large Content-Length
header for a POST request.
A remote attacker could inject arbitrary HTTP requests through an
HTTP/2 POST request with a large Content-Length header.
https://varnish-cache.org/security/VSV00007.html
https://github.com/varnishcache/varnish-cache/commit/7d73bc843ea9bff79e33773f1cfe2dffa7d03ea1
https://security.archlinux.org/CVE-2021-36740
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
NONE
AV:N/AC:L/Au:N/C:P/I:P/A:N
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EPSS
Percentile
79.9%