With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alVersionString
ALTIGA Version String
1.3.6.1.4.1.3076.2.1.2.1.1.4
The string representation of the VPN 3000 software version.
Back to ALTIGA-VERSION-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alVersionString on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.