Vulnerability Details : 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.
Products affected by CVE-2021-31894
- cpe:2.3:o:siemens:simatic_pcs_7_firmware:*:*:*:*:*:*:*:*
- 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:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:sinamics_starter_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:-:*:*:*:*:*:*
- cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:hf2:*:*:*:*:*:*
- cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:hf1:*:*:*:*:*:*
- 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:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-31894
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 10 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-31894
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
7.2
|
HIGH | AV:L/AC:L/Au:N/C:C/I:C/A:C |
3.9
|
10.0
|
NIST | |
|
8.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
2.0
|
6.0
|
NIST |
CWE ids for CVE-2021-31894
-
The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors.Assigned by: productcert@siemens.com (Primary)
References for CVE-2021-31894
-
https://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf
Patch;Vendor Advisory
Jump to