CVE-2021-28662: Input Validation
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.
Other sources
Due to an input validation bug Squid is vulnerable to a Denial of Service against all clients using the proxy. This problem allows a remote server to perform Denial of Service when delivering HTTP Response messages. The issue trigger is a header which can be expected to exist in HTTP traffic without any malicious intent by the server.
Upstream security advisory: https://github.com/squid-cache/squid/security/advisories/GHSA-jjq6-mh2h-g39h
— Red Hat
Affected Software
Remediation
Event History
Frequently Asked Questions
What is CVE-2021-28662?
CVE-2021-28662 is a vulnerability discovered in Squid 4.x before 4.15 and 5.x before 5.0.6.
What is the severity of CVE-2021-28662?
CVE-2021-28662 has a severity rating of 6.5 (high).
How does CVE-2021-28662 affect Squid?
CVE-2021-28662 can result in a denial of service if a remote server sends a specific response header over HTTP or HTTPS.
How can I fix CVE-2021-28662 in Squid?
To fix CVE-2021-28662, update Squid to version 4.15 or 5.0.6, depending on the version you are using.
Where can I find more information about CVE-2021-28662?
You can find more information about CVE-2021-28662 on the following references: [1] [2] [3].