curl 7.7 through 7.76.1 suffers from an information disclosure when the -t command line option, known as CURLOPT_TELNETOPTIONS in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol.
Exploitability
AV:NAC:HPR:NUI:RScope
S:UImpact
C:LI:NA:N3.1/CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:NInformation Disclosure