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It might be possible to run arbitrary code on the remote server.
The remote pop3 server seems vulnerable to a buffer overflow when
issued a very long user name (10,000 chars)
This *may* allow an attacker to execute arbitrary commands
as root on the remote POP3 server.
Contact your vendor about this vulnerability and ask for a patch.
Risk factor :
Critical / CVSS Base Score : 10.0
CVSS Temporal Score : 10.0