An issue was discovered in Squid before 4.15 and 5.x before 5.0.6. Due to an input-validation bug, it is vulnerable to a Denial of Service attack (against all clients using the proxy). A client sends an HTTP Range request to trigger this.
https://www.debian.org/security/2021/dsa-4924
https://security.netapp.com/advisory/ntap-20210716-0007/
https://lists.debian.org/debian-lts-announce/2021/06/msg00014.html
https://github.com/squid-cache/squid/security/advisories/GHSA-pxwq-f3qr-w2xf