Vulnerability in Siemens Simatic Mv420

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.021 (81.3th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2020-27632: rose from 0.012 to 0.021.

EPSS over last 30 days · oldest: 0.012 · newest: 0.021 · change: +0.009

Affected products

References

Frequently asked questions

What is CVE-2020-27632?
CVE-2020-27632 is a high-severity vulnerability in Siemens Simatic Mv420. CVSS score: 7.5/10. Published 2021-03-10.
How severe is CVE-2020-27632?
High severity. CVSS v3 base score is 7.5 out of 10.