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NVD / CVE Program· CNA schneider

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

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.63% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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)

HighCVSS 7.5 · v3.1—No exploit No fix recorded
Published
Feb 1, 2023
Updated
Jun 16, 2026
EPSS
0.6% · 49th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.5
CNA · schneider
7.5
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2021-22786

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
schneider-electricmodicon m340 bmxp341000 firmware
schneider-electricmodicon m340 bmxp341000
schneider-electricmodicon m340 bmxp342000 firmware
schneider-electricmodicon m340 bmxp342000
schneider-electricmodicon m340 bmxp342010 firmware
schneider-electricmodicon m340 bmxp342010
schneider-electricmodicon m340 bmxp3420102 firmware
schneider-electricmodicon m340 bmxp3420102
schneider-electricmodicon m340 bmxp342020 firmware
schneider-electricmodicon m340 bmxp342020
schneider-electricmodicon m340 bmxp342020h firmware
schneider-electricmodicon m340 bmxp342020h

and 70 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • schneider-electric modicon m340 bmxp341000 firmwarebefore 3.40
  • schneider-electric modicon m340 bmxp342000 firmwarebefore 3.40
  • schneider-electric modicon m340 bmxp342010 firmwarebefore 3.40
  • schneider-electric modicon m340 bmxp3420102 firmwarebefore 3.40
  • schneider-electric modicon m340 bmxp342020 firmwarebefore 3.40
  • schneider-electric modicon m340 bmxp342020h firmwarebefore 3.40
  • schneider-electric modicon m340 bmxp342030 firmwarebefore 3.40
  • schneider-electric modicon m340 bmxp3420302 firmwarebefore 3.40
  • schneider-electric modicon m340 bmxp3420302h firmwarebefore 3.40
  • schneider-electric modicon m340 bmxp342030h firmwarebefore 3.40
  • schneider-electric modicon m580 bmeh582040 firmwareup to 3.20 inclusive
  • schneider-electric modicon m580 bmeh582040c firmwareup to 3.20 inclusive
  • schneider-electric modicon m580 bmeh582040s firmwareup to 3.20 inclusive
  • schneider-electric modicon m580 bmeh584040 firmwareup to 3.20 inclusive
  • schneider-electric modicon m580 bmeh584040c firmwareup to 3.20 inclusive
  • schneider-electric modicon m580 bmeh584040s firmwareup to 3.20 inclusive
  • schneider-electric modicon m580 bmeh586040 firmwareup to 3.20 inclusive
  • schneider-electric modicon m580 bmeh586040c firmwareup to 3.20 inclusive
  • schneider-electric modicon m580 bmeh586040s firmwareup to 3.20 inclusive
  • schneider-electric modicon m580 bmep581020 firmwareup to 3.20 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (schneider). Independent of NVD's CPE analysis and usually ahead of it.

  • Schneider Electric Legacy Modicon Quantum

    • All Versionsaffected

  • Schneider Electric Modicon M340 CPU (part numbers BMXP34*)

    • All and later · before V3.30affected

  • Schneider Electric Modicon M580 CPU (part numbers BMEP* and BMEH*)

    • All and later · before V3.20affected

  • Schneider Electric Modicon M580 CPU Safety (part numbers BMEP58*S and BMEH58*S)

    • All Versionsaffected

  • Schneider Electric Modicon MC80 (BMKC80)

    • All and later · before V1.6affected

  • Schneider Electric Modicon Momentum CPU (171CBU*)

    • All and later · before V2.3affected

Same product

schneider-electric: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-7540A CWE-306: Missing Authentication for Critical Function vulnerability exists in the Web Server on Modicon M340, Legacy Offers Modicon Quantu
    40Plan
  • CVE-2023-6408 CWE-924: Improper Enforcement of Message Integrity During Transmission in a Communication Channel vulnerability exists that could cause a d
    32Monitor
  • CVE-2022-0222A CWE-269: Improper Privilege Management vulnerability exists that could cause a denial of service of the Ethernet communication of the cont
    30Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-7541Dec 10, 2020 · A CWE-425: Direct Request ('Forced Browsing') vulnerability exists in the Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modi
    21Monitor
  • ← EarlierCVE-2020-7549Dec 10, 2020 · A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists in the Web Server on Modicon M340, Legacy Offers Modico
    21Monitor
  • ← EarlierCVE-2022-22724Feb 4, 2022 · A CWE-400: Uncontrolled Resource Consumption vulnerability exists that could cause a denial of service on ports 80 (HTTP) and 502 (Modbus),
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Root cause

The extension requests broader permissions than its function needs and sends the data it collects out for purposes beyond its stated function.

The bug in code

The whole CWE-200 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

json
{  "permissions": ["tabs", "<all_urls>"],  "background": { "service_worker": "analytics.js" }}

Fixed

json
{  "permissions": ["activeTab"],  "host_permissions": ["https://yildiz.example/*"]}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records