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CVE-2026-3869

Quick assessment

Affected
Schneider Electric Modicon M580
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CWE-303：存在认证算法实现不当的漏洞，如果PLC上运行着应用安全级别较低的应用项目，可能导致PLC的机密性、完整性和可用性受损。

CVSS 9.2 · Critical EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 2

VendorProduct Version RangeStatus
Schneider Electric Modicon M580 All versions with an application level below 4.00 affected
Schneider Electric Modicon M580 Safety All versions with an application level below 4.20 affected
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I. Basic Information for CVE-2026-3869

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
CWE-303 : Incorrect Implementation of Authentication Algorithm vulnerability exists that could cause loss of confidentiality, integrity and availability of the PLC provided an application project with a lower application level is running on the PLC.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证算法的不正确实现
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Schneider Electric Modicon M580 All versions with an application level below 4.00 -
Schneider Electric Modicon M580 Safety All versions with an application level below 4.20 -

II. Public POCs for CVE-2026-3869

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-3869

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Vendor Advisories for CVE-2026-3869 (1)

IV. Related Vulnerabilities

Same product: Modicon M580
Same vendor: Schneider Electric
Same weakness: CWE-303

V. Comments for CVE-2026-3869

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