CVE-2021-31893
Last modified
CVE-2021-31893 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.56% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Siemens | Simatic Pcs Firmware | <= 8.2 |
| Siemens | Simatic Pcs Firmware | 9.0 |
| Siemens | Simatic Pdm Firmware | < 9.2 |
| Siemens | Simatic Step 7 Firmware | <= 5.6 |
| Siemens | Sinamics Starter Firmware | < 5.4 |
| Siemens | Sinamics Starter Firmware | 5.4 |
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-641963.pdfPatch, Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-641963.pdfPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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