MEDIUM
An issue was discovered in urllib2 in Python 2.x through 2.7.17 and urllib in Python 3.x through 3.8.0. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the host component of a URL) followed by an HTTP header. This is similar to the CVE-2019-9740 query string issue and the CVE-2019-9947 path string issue. (This is not exploitable when glibc has CVE-2016-10739 fixed.)
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00041.html
https://bugs.python.org/issue30458#msg347282
https://bugzilla.redhat.com/show_bug.cgi?id=1727276
https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html
https://security.netapp.com/advisory/ntap-20191107-0004/
Source: MITRE
Published: 2019-10-23
Updated: 2020-07-15
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