CVE-2021-22786

What it is

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)

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure.

Exploit odds

0.6% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2023-02-01 04:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:37 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.6% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2023-02-01 04:15 UTC

Last modified

2026-06-17 03:37 UTC

Exploit probability

0.6% · EPSS, next 30 days

Weakness

CWE-200 · Information exposure

Record status

Modified

Affected

• schneider-electric Modicon m340 bmxp341000 Firmware < 3.40
• schneider-electric Modicon m340 bmxp342000 Firmware < 3.40
• schneider-electric Modicon m340 bmxp342010 Firmware < 3.40
• schneider-electric Modicon m340 bmxp3420102 Firmware < 3.40
• schneider-electric Modicon m340 bmxp342020 Firmware < 3.40
• schneider-electric Modicon m340 bmxp342020h Firmware < 3.40
• schneider-electric Modicon m340 bmxp342030 Firmware < 3.40
• schneider-electric Modicon m340 bmxp3420302 Firmware < 3.40

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-22786.md and follow it. Check whether this project is affected by CVE-2021-22786. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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