In Twisted before 19.2.1, twisted.web did not validate or sanitize URIs or HTTP methods, allowing an attacker to inject invalid characters such as CRLF.
https://twistedmatrix.com/pipermail/twisted-python/2019-June/032352.html
https://labs.twistedmatrix.com/2019/06/twisted-1921-released.html
https://github.com/twisted/twisted/commit/6c61fc4503ae39ab8ecee52d10f10ee2c371d7e2
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00030.html
http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00042.html
https://usn.ubuntu.com/4308-1/
Source: MITRE
Published: 2019-06-10
Updated: 2023-02-28
Type: CWE-74
Base Score: 4.3
Vector: AV:N/AC:M/Au:N/C:N/I:P/A:N
Impact Score: 2.9
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 6.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Impact Score: 2.7
Exploitability Score: 2.8
Severity: MEDIUM