Vulnerability Details CVE-2020-27632
In SIMATIC MV400 family versions prior to v7.0.6, the ISN generator is initialized with a constant value and has constant increments. An attacker could predict and hijack TCP sessions.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 58.3%
CVSS Severity
CVSS v3 Score 7.5
CVSS v2 Score 5.0
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-599268.pdf
- https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01
- https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/
- https://cert-portal.siemens.com/productcert/pdf/ssa-599268.pdf
- https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01
- https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/
Products affected by CVE-2020-27632
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cpe:2.3:h:siemens:simatic_mv420:-
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cpe:2.3:h:siemens:simatic_mv440:-
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cpe:2.3:o:siemens:simatic_mv420_firmware:-
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cpe:2.3:o:siemens:simatic_mv440_firmware:-