CVE-2020-27632

Description

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.

References

https://www.tenable.com/cyber-exposure/2021-threat-landscape-retrospective

https://www.tenable.com/blog/numberjack-nine-vulnerabilities-across-multiple-open-source-tcpip-stacks

https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/

https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01

https://cert-portal.siemens.com/productcert/pdf/ssa-599268.pdf

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3