CVE-1999-1150

NONECVSS 0.0

0.0

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.

CVSS v3: —
EG Score: —
EPSS: 70.8%
KEV: Not listed

Published

June 30, 1998

Last Modified

April 16, 2026

References (4)

cve@mitrehttp://www.securityfocus.com/archive/1/9723
cve@mitrehttps://exchange.xforce.ibmcloud.com/vulnerabilities/1882
af854a3a-2127-422b-91ae-364da2661108http://www.securityfocus.com/archive/1/9723
af854a3a-2127-422b-91ae-364da2661108https://exchange.xforce.ibmcloud.com/vulnerabilities/1882

Data Freshness Timeline

(refreshed 13× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

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Frequently asked(4)

What is CVE-1999-1150?

CVE-1999-1150 is a none vulnerability published on June 30, 1998. 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.

When was CVE-1999-1150 disclosed?

CVE-1999-1150 was first published in the National Vulnerability Database on June 30, 1998, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-1999-1150 actively exploited?

CVE-1999-1150 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 70.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

How do I remediate CVE-1999-1150?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-1999-1150, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-1999-1150

📅 Published

🔄 Last Modified

🔗 References (4)