CVE-2021-31893
7.8 · HIGHOverview
CVE-2021-31893 is a high-severity vulnerability affecting siemens simatic_pcs_firmware. It was published on July 13, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from siemens. Update simatic_pcs_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| siemens | simatic_pcs_firmware | 0 | Affected |
| siemens | simatic_pdm_firmware | >= 0, < 9.2 | Affected |
| siemens | simatic_step_7_firmware | 0 | Affected |
| siemens | sinamics_starter_firmware | >= 0, < 5.4 | Affected |
Frequently Asked Questions
What is CVE-2021-31893?
CVE-2021-31893 is a high-severity vulnerability affecting siemens simatic_pcs_firmware. It was published on July 13, 2021 and has a CVSS 3.1 base score of 7.8 (HIGH).
How severe is CVE-2021-31893?
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2021-31893?
Check the references section for vendor advisories and patches from siemens. Update simatic_pcs_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-31893?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-31893 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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