CVE-2021-31893

Description

A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3), SIMATIC PDM (All versions < V9.2), SIMATIC STEP 7 V5.X (All versions < V5.6 SP2 HF3), SINAMICS STARTER (containing STEP 7 OEM version) (All versions < V5.4 HF2). The affected software contains a buffer overflow vulnerability while handling certain files that could allow a local attacker to trigger a denial-of-service condition or potentially lead to remote code execution.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.13%
Vendor Advisory siemens.com
Affected: Siemens SIMATIC PCS 7 V8.2 and earlier
Affected: Siemens SIMATIC PCS 7 V9.0
Affected: Siemens SIMATIC PDM
Affected: Siemens SIMATIC STEP 7 V5.X
Affected: Siemens SINAMICS STARTER (containing STEP 7 OEM version)
Published at:
Updated at:

References

Link Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-641963.pdf patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-31893?
CVE-2021-31893 has been scored as a high severity vulnerability.
How to fix CVE-2021-31893?
To fix CVE-2021-31893, 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-2021-31893 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-31893 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-31893?
CVE-2021-31893 affects Siemens SIMATIC PCS 7 V8.2 and earlier, Siemens SIMATIC PCS 7 V9.0, Siemens SIMATIC PDM, Siemens SIMATIC STEP 7 V5.X, Siemens SINAMICS STARTER (containing STEP 7 OEM version).
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.