High severity8.8NVD Advisory· Published Jul 13, 2021· Updated Jun 17, 2026
CVE-2021-31894
CVE-2021-31894
Description
A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions < V9.1 SP2), SIMATIC PDM (All versions < V9.2 SP2), SIMATIC STEP 7 V5.X (All versions < V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions < V5.4 SP2 HF1). A directory containing metafiles relevant to devices' configurations has write permissions. An attacker could leverage this vulnerability by changing the content of certain metafiles and subsequently manipulate parameters or behavior of devices that would be later configured by the affected software.
Affected products
20cpe:2.3:o:siemens:simatic_pcs_7_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:siemens:simatic_pcs_7_firmware:*:*:*:*:*:*:*:*range: <=8.2
- cpe:2.3:o:siemens:simatic_pcs_7_firmware:9.0:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_pdm_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_step_7_firmware:*:*:*:*:*:*:*:*Range: >=5.0,<5.7
cpe:2.3:o:siemens:sinamics_starter_firmware:*:*:*:*:*:*:*:*+ 6 more
- cpe:2.3:o:siemens:sinamics_starter_firmware:*:*:*:*:*:*:*:*range: <5.4
- cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:-:*:*:*:*:*:*
- cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:hf1:*:*:*:*:*:*
- cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:hf2:*:*:*:*:*:*
- cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:sp1:*:*:*:*:*:*
- cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:sp1_hf1:*:*:*:*:*:*
- cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:sp2:*:*:*:*:*:*
- Range: <V9.2 SP2
<=V8.2, <V9.1 SP2+ 2 more
- (no CPE)range: <=V8.2, <V9.1 SP2
- (no CPE)range: All versions < V9.1 SP2
- (no CPE)range: All versions < V9.2 SP2
- Range: <V5.7
- Range: <V5.4 SP2 HF1
- Siemens/SIMATIC PCS 7 V8.2 and earlierv5Range: All versions
- Range: All versions < V5.7
- Siemens/SINAMICS STARTER (containing STEP 7 OEM version)v5Range: All versions < V5.4 SP2 HF1
Patches
Vulnerability mechanics
References
1- cert-portal.siemens.com/productcert/pdf/ssa-661034.pdfnvdPatchVendor Advisory
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