CVE-1999-1150: Livingston Portmaster routers running ComOS use the same initial sequence number (ISN) for TCP connections, which allows

Published n/a Updated 2026-08-21T04:30:40.400Z

Summary

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.

Severity

UNKNOWN

Source Attribution

Source: NVD · Updated: 2026-08-21T04:30:40.400Z · Confidence: high

Impact

Based on CVSS vector: n/a — assess confidentiality, integrity, and availability impact via the official vector documentation.

Affected Software

Fix

Upgrade affected software to the fixed version identified above. Apply vendor patches and monitor advisories before exposed systems go unpatched.

References