Short Name |
SMTP:COMMAND:EXPN |
---|---|
Severity |
Minor |
Recommended |
No |
Category |
SMTP |
Release Date |
2003/08/27 |
Update Number |
1213 |
Supported Platforms |
di-5.3+, idp-4.0+, isg-3.0+, j-series-9.5+, mx-11.4+, srx-12.1+, srx-branch-12.1+, vmx-17.4+, vsrx-12.1+, vsrx3bsd-18.2+ |
This protocol anomaly triggers when it detects an attempt to use the EXPN command. This command is not used by most standard clients and servers and can reveal information about e-mail accounts.
Receiving a SMTP EXPN command could indicate a non-standard SMTP implementation, a configuration error or that an attacker is attempting to gather information about a server to plan an attack.