Vulnerability Details : CVE-2021-31893
A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.0 (All versions < V9.0 SP3), SIMATIC PDM (All versions < V9.2), SIMATIC STEP 7 V5.X (All versions < V5.6 SP2 HF3), SINAMICS STARTER (containing STEP 7 OEM version) (All versions < V5.4 HF2). The affected software contains a buffer overflow vulnerability while handling certain files that could allow a local attacker to trigger a denial-of-service condition or potentially lead to remote code execution.
Vulnerability category: OverflowExecute codeDenial of service
Products affected by CVE-2021-31893
- 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:hotfix_1:*:*:*:*:*:*
- cpe:2.3:o:siemens:sinamics_starter_firmware:5.4:hotfix_2:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_pcs_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_pcs_firmware:9.0:-:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_pcs_firmware:9.0:sp1:*:*:*:*:*:*
- cpe:2.3:o:siemens:simatic_pcs_firmware:9.0:sp2:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-31893
0.13%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 34 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-31893
| 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 | |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST |
CWE ids for CVE-2021-31893
-
The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.Assigned by: productcert@siemens.com (Primary)
References for CVE-2021-31893
-
https://cert-portal.siemens.com/productcert/pdf/ssa-641963.pdf
Patch;Vendor Advisory
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