CVE-2021-33737
Last modified
CVE-2021-33737 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. EPSS estimates a 1.02% chance of exploitation in the next 30 days.
Description
A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (All versions < V3.3), SIMATIC CP 443-1 (All versions < V3.3), SIMATIC CP 443-1 Advanced (All versions < V3.3), SIPLUS NET CP 443-1 (All versions < V3.3), SIPLUS NET CP 443-1 Advanced (All versions < V3.3). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Siemens | Simatic Cp 343-1 Firmware | All versions |
| Siemens | Simatic Cp 343-1 Advanced Firmware | All versions |
| Siemens | Simatic Cp 343-1 Erpc Firmware | All versions |
| Siemens | Simatic Cp 343-1 Lean Firmware | All versions |
| Siemens | Simatic Cp 443-1 Firmware | All versions |
| Siemens | Simatic Cp 443-1 Advanced Firmware | All versions |
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-549234.pdfPatch, Vendor Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-549234.pdfPatch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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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.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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