pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to set_tlsext_servername_callback raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.
0.13-2ubuntu40.13-2ubuntu50.13-2ubuntu60.15.1-2build10.15.1-2ubuntu0.216.2.0-117.5.0-117.5.0-1ubuntu119.0.0-119.0.0-1build121.0.0-1ubuntu0.123.2.0-1ubuntu0.125.0.0-1ubuntu0.1Exploitability
AV:NAC:HAT:PPR:NUI:NVulnerable System
VC:NVI:LVA:NSubsequent System
SC:NSI:NSA:NCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U