In Twisted Web through 19.10.0, there was an HTTP request splitting vulnerability. When presented with a content-length and a chunked encoding header, the content-length took precedence and the remainder of the request body was interpreted as a pipelined request.
https://usn.ubuntu.com/4308-2/
https://usn.ubuntu.com/4308-1/
https://security.gentoo.org/glsa/202007-24
https://lists.debian.org/debian-lts-announce/2022/02/msg00021.html
https://know.bishopfox.com/advisories/twisted-version-19.10.0
Published: 2020-03-12
Updated: 2024-11-25
Base Score: 7.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
Severity: High
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: Critical
Base Score: 9.3
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Severity: Critical