TCP Sequence Number Validation Flaw in SIMATIC MV400 by Siemens
CVE-2020-25241

7.5HIGH

Key Information:

Vendor

Siemens
Status
Simatic Mv400 Family
Vendor
CVE Published:
15 March 2021

What is CVE-2020-25241?

A vulnerability exists within the SIMATIC MV400 family affecting all versions prior to V7.0.6, related to the TCP stack's failure to properly validate sequence numbers for incoming TCP RST packets. This flaw can be exploited by an attacker to disrupt and terminate arbitrary TCP sessions, potentially impacting the integrity and availability of network communications.

Affected Version(s)

SIMATIC MV400 family All Versions < V7.0.6

References

https://cert-portal.siemens.com/productcert/pdf/ssa-59926...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.
CVE-2020-25241 : TCP Sequence Number Validation Flaw in SIMATIC MV400 by Siemens