http.client in Python 3.x before 3.5.10, 3.6.x before 3.6.12, 3.7.x before 3.7.9, and 3.8.x before 3.8.5 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of HTTPConnection.request.
https://bugs.python.org/issue39603
https://python-security.readthedocs.io/vuln/http-header-injection-method.html
https://usn.ubuntu.com/4581-1/
https://security.netapp.com/advisory/ntap-20201023-0001/
http://lists.opensuse.org/opensuse-security-announce/2020-11/msg00027.html
https://lists.debian.org/debian-lts-announce/2020/11/msg00032.html
Source: MITRE
Published: 2020-09-27
Updated: 2021-12-07
Type: CWE-116
Base Score: 6.4
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:N
Impact Score: 4.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.2
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Impact Score: 2.7
Exploitability Score: 3.9
Severity: HIGH