CVE-2021-33737

HighCVSS 7.5/10Last modified Jun 17, 2026

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 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-119

Affected software

VendorProductVersions
SiemensSIMATIC CP 343-1 (incl. SIPLUS variants)All versions
SiemensSIMATIC CP 343-1 Advanced (incl. SIPLUS variants)All versions
SiemensSIMATIC CP 343-1 ERPCAll versions
SiemensSIMATIC CP 343-1 Lean (incl. SIPLUS variants)All versions
SiemensSIMATIC CP 443-1All versions < V3.3
SiemensSIMATIC CP 443-1All versions < V3.3
SiemensSIMATIC CP 443-1 AdvancedAll versions < V3.3
SiemensSIPLUS NET CP 443-1All versions < V3.3
SiemensSIPLUS NET CP 443-1 AdvancedAll versions < V3.3

References

Timeline

Published
Sep 14, 2021
Last modified
Jun 17, 2026
NVD status
Modified

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CVE-2021-33737: High severity, CVSS 7.5 | Vulnix