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CVE-2019-6855· NVD / CVE Program· CNA schneider

Incorrect Authorization vulnerability exists in EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), M

Incorrect Authorization vulnerability exists in EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), Modicon M340 (all versions prior to V3.20) , and Modicon M580 (all versions prior to V3.10), which could cause a bypass of the authentication process between EcoStruxure Control Expert and the M340 and M580 controllers.

HighCVSS 7.3 · v3.1—No exploit No fix recorded
Published
Jan 6, 2020
Updated
Jun 16, 2026
EPSS
1.0% · 60th percentile
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JSON

Action score

29

Monitor

Low priority for now.

CVSS
29 / 40 · 7.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

Noroxi analysis

No Noroxi analysis for this record yet

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Affected systems

VendorProduct
schneider-electricecostruxure control expert
schneider-electricunity pro
schneider-electricmodicon m580 bmep584040 firmware
schneider-electricmodicon m580 bmep584040
schneider-electricmodicon m580 bmeh584040 firmware
schneider-electricmodicon m580 bmeh584040
schneider-electricmodicon m580 bmep586040 firmware
schneider-electricmodicon m580 bmep586040
schneider-electricmodicon m580 bmeh586040 firmware
schneider-electricmodicon m580 bmeh586040
schneider-electricmodicon m580 bmep581020 firmware
schneider-electricmodicon m580 bmep581020

and 32 more

Affected versions

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

  • schneider-electric ecostruxure control expertbefore 14.1
  • schneider-electric ecostruxure control expert14.1
  • schneider-electric modicon m340 bmxp341000 firmwarebefore 3.20
  • schneider-electric modicon m340 bmxp342000 firmwarebefore 3.20
  • schneider-electric modicon m340 bmxp3420102 firmwarebefore 3.20
  • schneider-electric modicon m340 bmxp342020 firmwarebefore 3.20
  • schneider-electric modicon m340 bmxp3420302 firmwarebefore 3.20
  • schneider-electric modicon m580 bmeh582040 firmwarebefore 3.10
  • schneider-electric modicon m580 bmeh584040 firmwarebefore 3.10
  • schneider-electric modicon m580 bmeh584040s firmwarebefore 3.10
  • schneider-electric modicon m580 bmeh586040 firmwarebefore 3.10
  • schneider-electric modicon m580 bmeh586040s firmwarebefore 3.10
  • schneider-electric modicon m580 bmep581020 firmwarebefore 3.10
  • schneider-electric modicon m580 bmep582020 firmwarebefore 3.10
  • schneider-electric modicon m580 bmep582040 firmwarebefore 3.10
  • schneider-electric modicon m580 bmep582040s firmwarebefore 3.10
  • schneider-electric modicon m580 bmep583020 firmwarebefore 3.10
  • schneider-electric modicon m580 bmep583040 firmwarebefore 3.10
  • schneider-electric modicon m580 bmep584020 firmwarebefore 3.10
  • schneider-electric modicon m580 bmep584040 firmwarebefore 3.10

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.

  • n/a EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), Modicon M340 (all versions prior to V3.20) , and Modicon M580 (all versions prior to V3.10)

    • EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), Modicon M340 (all versions prior to V3.20) , and Modicon M580 (all versions prior to V3.10)affected

Same product

schneider-electric: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-28212A CWE-307: Improper Restriction of Excessive Authentication Attempts vulnerability exists in PLC Simulator on EcoStruxureª Control Expert (n
    40Plan
  • CVE-2022-45789A CWE-294: Authentication Bypass by Capture-replay vulnerability exists that could cause execution of unauthorized Modbus functions on the c
    39Monitor
  • CVE-2022-45788A CWE-754: Improper Check for Unusual or Exceptional Conditions vulnerability exists that could cause arbitrary code execution, denial of se
    39Monitor
  • CVE-2022-37300A CWE-640: Weak Password Recovery Mechanism for Forgotten Password vulnerability exists that could cause unauthorized access in read and wri
    39Monitor
  • CVE-2021-22797A CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal) vulnerability exists that could cause malicious scri
    39Monitor
  • CVE-2020-7475A CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'), reflective DLL, vulnerability
    39Monitor

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
low · data can be read
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-863 · Incorrect Authorization

CVSS vector

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

nvd-primary

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

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