CVE-2020-27632
HIGHCVSS 7.5/10EPSS 1.21%
Last modified
CVE-2020-27632 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.21% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Siemens | Simatic Mv420 Firmware | < 7.0.6 |
| Siemens | Simatic Mv440 Firmware | < 7.0.6 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2020-27632?
CVE-2020-27632 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.21% probability of exploitation in the next 30 days.
How do I fix CVE-2020-27632?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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Are you affected by CVE-2020-27632?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST