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The remote service is vulnerable to an access control breach.
The remote SMTP server seems to be protected by a content
filtering firewall probably Cisco's PIX.
However, an attacker may bypass this content filtering
by issuing a DATA command before a MAIL command,
that allows him to directly communicate with the real SMTP daemon.
See also :
Risk factor :
High / CVSS Base Score : 7.5
CVSS Temporal Score : 7.1
Nessus Plugin ID: 10520 ()
Bugtraq ID: 1698
CVE ID: CVE-2000-1022
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