IBM Personal Communications 14.0.6 through 15.0.1 includes a Windows service that is vulnerable to remote code execution (RCE) and local privilege escalation (LPE). The vulnerability allows any unprivileged user with network access to a target computer to run commands with full privileges in the context of NT AUTHORITY\SYSTEM. This allows for a low privileged attacker to move laterally to affected systems and to escalate their privileges. IBM X-Force ID: 281619.

IBM Personal Communications (aka PCOMM) 6.x before 6.0.17 and 12.x before 12.0.0.1 does not properly restrict credential extraction, which allows local users to discover passwords by leveraging access to the victim account and executing a PowerShell script.

Stack-based buffer overflow in pcspref.dll in pcsws.exe in IBM Personal Communications 5.9.x before 5.9.8 and 6.0.x before 6.0.4 might allow remote attackers to execute arbitrary code via a long profile string in a WorkStation (aka .ws) file.

Multiple TCP implementations with Protection Against Wrapped Sequence Numbers (PAWS) with the timestamps option enabled allow remote attackers to cause a denial of service (connection loss) via a spoofed packet with a large timer value, which causes the host to discard later packets because they appear to be too old.