Vulnerability Details : CVE-2021-27395
A vulnerability has been identified in SIMATIC Process Historian 2013 and earlier (All versions), SIMATIC Process Historian 2014 (All versions < SP3 Update 6), SIMATIC Process Historian 2019 (All versions), SIMATIC Process Historian 2020 (All versions). An interface in the software that is used for critical functionalities lacks authentication, which could allow a malicious user to maliciously insert, modify or delete data.
Products affected by CVE-2021-27395
- cpe:2.3:a:siemens:simatic_process_historian_2013:*:*:*:*:*:*:*:*
- cpe:2.3:a:siemens:simatic_process_historian_2014:-:sp1:*:*:*:*:*:*
- cpe:2.3:a:siemens:simatic_process_historian_2014:-:sp2:*:*:*:*:*:*
- cpe:2.3:a:siemens:simatic_process_historian_2014:-:sp3:*:*:*:*:*:*
- cpe:2.3:a:siemens:simatic_process_historian_2014:-:sp3_update4:*:*:*:*:*:*
- cpe:2.3:a:siemens:simatic_process_historian_2019:*:*:*:*:*:*:*:*
- cpe:2.3:a:siemens:simatic_process_historian_2020:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-27395
0.25%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 45 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-27395
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.5
|
MEDIUM | AV:N/AC:L/Au:S/C:N/I:P/A:P |
8.0
|
4.9
|
NIST | |
|
8.1
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H |
2.8
|
5.2
|
NIST |
CWE ids for CVE-2021-27395
-
The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.Assigned by: productcert@siemens.com (Primary)
References for CVE-2021-27395
-
https://cert-portal.siemens.com/productcert/pdf/ssa-766247.pdf
Vendor Advisory
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