An issue was discovered in Squid 3.x and 4.x through 4.8. Due to incorrect input validation, there is a heap-based buffer overflow that can result in Denial of Service to all clients using the proxy. Severity is high due to this vulnerability occurring before normal security checks; any remote client that can reach the proxy port can trivially perform the attack via a crafted URI scheme.
https://bugzilla.suse.com/show_bug.cgi?id=1156329
http://www.squid-cache.org/Advisories/SQUID-2019_8.txt
https://github.com/squid-cache/squid/pull/275
https://usn.ubuntu.com/4213-1/
https://www.debian.org/security/2020/dsa-4682
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html
Source: MITRE
Published: 2019-11-26
Updated: 2023-03-03
Type: CWE-787
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH