What’s Vulnerable › Vulnerabilities

CVE-2019-6855

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-01-06 · updated 2026-06-17
• Weakness: CWE-863

Description

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.

Affected products

• Schneider Electric EcoStruxure Control Expert: before 14.1; 14.1 — fixed in 14.1
• Schneider-Electric Modicon M340 Bmxp341000 Firmware: before 3.20 — fixed in 3.20
• Schneider-Electric Modicon M340 Bmxp342000 Firmware: before 3.20 — fixed in 3.20
• Schneider-Electric Modicon M340 Bmxp3420102 Firmware: before 3.20 — fixed in 3.20
• Schneider-Electric Modicon M340 Bmxp342020 Firmware: before 3.20 — fixed in 3.20
• Schneider-Electric Modicon M340 Bmxp3420302 Firmware: before 3.20 — fixed in 3.20
• Schneider-Electric Modicon M580 Bmeh582040 Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmeh584040 Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmeh584040S Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmeh586040 Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmeh586040S Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmep581020 Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmep582020 Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmep582040 Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmep582040S Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmep583020 Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmep583040 Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmep584020 Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmep584040 Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmep584040S Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmep585040 Firmware: before 3.10 — fixed in 3.10
• Schneider-Electric Modicon M580 Bmep586040 Firmware: before 3.10 — fixed in 3.10
• Schneider Electric Unity Pro: all versions

How to fix

Upgrade to a fixed version: Schneider Electric EcoStruxure Control Expert 14.1; Schneider-Electric Modicon M340 Bmxp341000 Firmware 3.20; Schneider-Electric Modicon M340 Bmxp342000 Firmware 3.20; Schneider-Electric Modicon M340 Bmxp3420102 Firmware 3.20; Schneider-Electric Modicon M340 Bmxp342020 Firmware 3.20; Schneider-Electric Modicon M340 Bmxp3420302 Firmware 3.20; Schneider-Electric Modicon M580 Bmeh582040 Firmware 3.10; Schneider-Electric Modicon M580 Bmeh584040 Firmware 3.10; Schneider-Electric Modicon M580 Bmeh584040S Firmware 3.10; Schneider-Electric Modicon M580 Bmeh586040 Firmware 3.10; Schneider-Electric Modicon M580 Bmeh586040S Firmware 3.10; Schneider-Electric Modicon M580 Bmep581020 Firmware 3.10. Check the vendor advisory for mitigations.

References

• https://www.se.com/ww/en/download/document/SEVD-2019-344-02/
• https://www.se.com/ww/en/download/document/SEVD-2019-344-02/

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