CVE-2018-4850

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.

Category

7.5
CVSS
Severity: High
CVSS 3.0 •
CVSS 2.0 •
EPSS 0.61%
Vendor Advisory siemens.com Vendor Advisory siemens.com
Affected: Siemens AG SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below, SIMATIC S7-400 (incl. F) CPU hardware version 5.0, SIMATIC S7-400H CPU hardware version 4.5 and below
Published at:
Updated at:

References

Link Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-914382.pdf vendor advisory
http://www.securityfocus.com/bid/104217 vdb entry third party advisory
https://www.siemens.com/global/en/home/products/services/cert.html#SecurityPublications vendor advisory

Frequently Asked Questions

What is the severity of CVE-2018-4850?
CVE-2018-4850 has been scored as a high severity vulnerability.
How to fix CVE-2018-4850?
To fix CVE-2018-4850, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2018-4850 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2018-4850 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2018-4850?
CVE-2018-4850 affects Siemens AG SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below, SIMATIC S7-400 (incl. F) CPU hardware version 5.0, SIMATIC S7-400H CPU hardware version 4.5 and below.
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