CVE-1999-1150

High CVSS 7.5

Published 1998-06-30 · last changed 2026-06-16

The fix

We hold no Microsoft remediation data for CVE-1999-1150, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

Livingston Portmaster routers running ComOS use the same initial sequence number (ISN) for TCP connections, which allows remote attackers to conduct spoofing and hijack TCP sessions.

Sources

NVD record for CVE-1999-1150

CVSS vector: AV:N/AC:L/Au:N/C:P/I:P/A:P