What’s Vulnerable › Vulnerabilities

CVE-2021-27395

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-12 · updated 2026-06-17
• Weakness: CWE-306

Description

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.

Affected products

• Siemens Simatic Process Historian 2013: all versions
• Siemens SIMATIC Process Historian 2014: all versions
• Siemens SIMATIC Process Historian 2019: all versions
• Siemens SIMATIC Process Historian 2020: all versions

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-766247.pdf
• https://cert-portal.siemens.com/productcert/pdf/ssa-766247.pdf

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