HTTP: Squid Proxy HTTP Header Handling Denial of Service
This signature detects attempts to exploit a known vulnerability against Squid Proxy. A successful attack can result in a denial-of-service condition.
Extended Description
An issue was discovered in Squid 4.x before 4.15 and 5.x before 5.0.6. If a remote server sends a certain response header over HTTP or HTTPS, there is a denial of service. This header can plausibly occur in benign network traffic.
Affected Products
Fedoraproject fedora
Short Name
HTTP:DOS:SQUID-PRXY-VARY-HDR
Severity
Minor
Recommended
False
Recommended Action
Drop
Category
HTTP
Keywords
CVE-2021-28662 CVE-2021-33620 Denial HTTP Handling Header Proxy Service Squid of
Release Date
11/30/2021
Supported Platforms
srx-branch-12.3
srx-19.3
srx-branch-19.3
vsrx3bsd-19.2
srx-branch-19.4
vsrx-19.4
mx-12.3
mx-19.4
vmx-19.4
mx-19.3
vsrx3bsd-19.4
srx-19.4
vsrx-12.3
vmx-19.3
vsrx-19.2
srx-12.3
Sigpack Version
3590
False Positive
Unknown
Vendors
Fedoraproject
Squid-cache
Debian
CVSS Score
4.0
4.3