CVE-2021-31894
Siemens · published 2021-07-13
Source record Collected from the National Vulnerability Database (NVD)
Description
Description by Siemens AG via the CVE Program.
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.
Status at the source
- NVD status: Modified
Affected products, as the source lists them
| Vendor | Product | Versions |
|---|---|---|
| Siemens | SIMATIC PCS 7 V8.2 and earlier | All versions: affected |
| Siemens | SIMATIC PCS 7 V9.X | All versions < V9.1 SP2: affected |
| Siemens | SIMATIC PDM | All versions < V9.2 SP2: affected |
| Siemens | SIMATIC STEP 7 V5.X | All versions < V5.7: affected |
| Siemens | SINAMICS STARTER (containing STEP 7 OEM version) | All versions < V5.4 SP2 HF1: affected |
Products named in NVD's CPE match criteria (4)
cpe:2.3:o:siemens:simatic_pcs_7_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:siemens:simatic_pdm_firmware:-:*:*:*:*:*:*:*cpe:2.3:o:siemens:simatic_step_7_firmware:*:*:*:*:*:*:*:*cpe:2.3:o:siemens:sinamics_starter_firmware:*:*:*:*:*:*:*:*
DeSpy has not checked any unit, hardware revision or firmware. A product missing here is not a statement that it is unaffected.
Scores, as their sources published them
- CVSS 3.1: 8.8 HIGH — as published by NIST (Primary)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - CVSS 2.0: 7.2 HIGH — as published by NIST (Primary)
AV:L/AC:L/Au:N/C:C/I:C/A:C
DeSpy does not score records. These are the sources' own values.
Weaknesses
Sources
References the source lists
- https://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf
Source dates: published 2021-07-13, last changed 2026-06-17. DeSpy's copy of this version is dated 2026-09-28.
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