Vulnerability CVE-2018-4850
Published: 2018-05-16

Description:
A vulnerability has been identified in SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below (All versions), SIMATIC S7-400 (incl. F) CPU hardware version 5.0 (All firmware versions < V5.2), SIMATIC S7-400H CPU hardware version 4.5 and below (All versions). The affected CPUs improperly validate S7 communication packets which could cause a Denial-of-Service condition of the CPU. The CPU will remain in DEFECT mode until manual restart.

Type:

CWE-noinfo

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Siemens -> Simatic s7-400 firmware 
Siemens -> Simatic s7-400h firmware 

 References:
http://www.securityfocus.com/bid/104217
https://cert-portal.siemens.com/productcert/pdf/ssa-914382.pdf
https://www.siemens.com/global/en/home/products/services/cert.html#SecurityPublications
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