urllib in Python 2.x through 2.7.16 supports the local_file: scheme, which makes it easier for remote attackers to bypass protection mechanisms that blacklist file: URIs, as demonstrated by triggering a urllib.urlopen('local_file:///etc/passwd') call.
2.7.12-1ubuntu0~16.04.83.5.2-2ubuntu0~16.04.82.7.15-4ubuntu4~18.04.13.6.8-1~18.04.22.7.6-8ubuntu0.6+esm23.4.3-1ubuntu1~14.04.7+esm23.5.2-2ubuntu0~16.04.4~14.04.1+esm1Exploitability
AV:NAC:LPR:NUI:NScope
S:UImpact
C:HI:HA:NCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N