CVE-1999-1150
Livingston Portmaster routers running ComOS use the same initial sequence number (ISN) for TCP...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-1999-1150- CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-1999-1150- Updated
- 2026-11-02
EUVDEUVD-1999-1131 No score
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.
- Record
EUVD-1999-1131- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vxxg-9388-x757 No score
Livingston Portmaster routers running ComOS use the same initial sequence number (ISN) for TCP...
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.
- Record
GHSA-vxxg-9388-x757- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-1999-1150 is a high vulnerability (CVSS 7.5) in Livingston Portmaster Portmaster, published June 30, 1998. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.35%, the 71st percentile. No source names a fixed version.