CVE Catalog

CVE-1999-1150

High
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Elevated risk
1.36%

68th percentile - higher than 68% of all known CVEs

Summary

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

Risk Assessment

Attackers can take control of TCP sessions, potentially leading to unauthorized access to data and services on the network.

Recommendation

It is recommended to update the router firmware to the latest version that improves the generation of sequence numbers for TCP connections.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS