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No, not marked obsolete: "Changed in version 2.3: Disabled
module."

"While the rexec module is designed to perform as described
below, it does have a few known vulnerabilities which could
be exploited by carefully written code. "

Even in 2.2, when it still was enabled, it did not actually
do what it was designed to do, and it is not possible to fix
it. Also, there is no replacement available.