Performing a TCP SYN or TCP connect scan on a host running Symantec pcAnywhere will cause the program to crash. Restarting the application is required in order to regain normal functionality.
nmap -sS target
Symantec pcAnywhere TCP SYN Scan Handling Remote DoS
Remote / Network Access
Denial of Service
Loss of Availability
pcAnywhere contains a flaw that may allow a remote denial of service. The issue is triggered when a remote attacker sends excessive traffic to pcAnywhere related ports, and will result in loss of availability for the service.
Upgrade to version 9.01 or higher, as it has been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.