High severity7.5NVD Advisory· Published Sep 14, 2021· Updated Jun 17, 2026
CVE-2021-33737
CVE-2021-33737
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.
Affected products
16- Range: All versions
- Range: < V3.3
All versions < V3.3+ 1 more
- (no CPE)range: All versions < V3.3
- cpe:2.3:o:siemens:simatic_cp_443-1_firmware:*:*:*:*:*:*:*:*
- Range: All versions < V3.3
All versions+ 2 more
- (no CPE)range: All versions
- (no CPE)range: All versions
- (no CPE)range: All versions
- Range: All versions < V3.3
- Range: All versions
- Range: All versions < V3.3
- cpe:2.3:o:siemens:simatic_cp_343-1_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_cp_343-1_erpc_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_cp_343-1_lean_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_cp_443-1_advanced_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_cp_343-1_advanced_firmware:*:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
1- cert-portal.siemens.com/productcert/pdf/ssa-549234.pdfnvdPatchVendor Advisory
News mentions
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