high7.5
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.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Siemens | Simatic Mv420 Firmware | before 7.0.6 |
| Siemens | Simatic Mv440 Firmware | before 7.0.6 |
References
- NVD record
- CVE.org record
- 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/