CVE-1999-1150

Severity: high (CVSS 7.5 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 1998-06-30 · updated 2026-06-16

Description

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.

Affected products

Livingston Portmaster Portmaster: initial

References

http://www.securityfocus.com/archive/1/9723
https://exchange.xforce.ibmcloud.com/vulnerabilities/1882
http://www.securityfocus.com/archive/1/9723
https://exchange.xforce.ibmcloud.com/vulnerabilities/1882

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