Security readout for executives and security teams
This is an old but serious network weakness in Livingston Portmaster routers running ComOS. The devices reportedly reused the same TCP starting sequence value, which could let a remote attacker impersonate or take over TCP sessions. Business urgency depends on whether these legacy routers still exist in production or exposed environments. Exposure is likely limited to legacy Livingston Portmaster routers running ComOS. The bundle does not identify specific versions, CPEs, current product support status, or cloud/software exposure. Treat this as a legacy exposure discovery item. It becomes urgent if Portmaster ComOS routers are still internet-facing or used in trusted network paths. If no such devices exist, document non-exposure and close with evidence. Mitigation focus: Inventory for Livingston Portmaster routers running ComOS.; Check vendor or archival guidance for any ComOS fix or advisory.; Remove, replace, or isolate unsupported legacy routers where feasible..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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CVE-1999-1150 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
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- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
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CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- portmaster-fixed-isn(1882)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
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