Predictable and Hijackable TCP Sessions in SIMATIC MV400 Family Versions Prior to v7.0.6

CVE-2020-27632 · HIGH Severity

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.

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