Heap-based buffer overflow in smtp_in.c for Exim 3 (exim3) before 3.36
and Exim 4 (exim4) before 4.21 may allow remote attackers to execute
arbitrary code via an invalid (1) HELO or (2) EHLO argument with a
large number of spaces followed by a NULL character and a newline,
which is not properly trimmed before the "(no argument given)" string
is appended to the buffer.
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BUGTRAQ:20030901 exim remote heap overflow, probably not exploitable
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