Vulnerability in Siemens Simatic Pcs 7
CVE-2021-31894
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (12.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Siemens Simatic Pcs 7
- Siemens Simatic Pcs 7 Firmware — versions 9.0
- Siemens Simatic Pcs 7 V8.2 And Earlier — versions All versions
- Siemens Simatic Pcs 7 V9.x — versions All versions < V9.1 SP2
- Siemens Simatic Pdm — versions All versions < V9.2 SP2
- Siemens Simatic Pdm
- Siemens Simatic Pdm Firmware
- Siemens Simatic Step 7
- Siemens Simatic Step 7 Firmware
- Siemens Simatic Step 7 V5.x — versions All versions < V5.7
Weakness classification (CWE)
References
- cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2021-31894?
- CVE-2021-31894 is a high-severity vulnerability in Siemens Simatic Pcs 7, classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 8.8/10. Published 2021-07-13.
- How severe is CVE-2021-31894?
- High severity. CVSS v3 base score is 8.8 out of 10.