Authentication bypass by spoofing in Schneider Electric Modicon M340 CPU
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-290.
Summary
CWE-290: Authentication Bypass by Spoofing vulnerability exists that could cause a denial of service and loss of confidentiality and integrity of controllers when conducting a Man-In-The-Middle attack between the controller and the engineering workstation while a valid user is establishing a communication session. This vulnerability is inherent to Diffie Hellman algorithm which does not protect against Man-In-The-Middle attacks.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Schneider Electric | Modicon M340 CPU (part numbers BMXP34*) | All versions since SV3.60 | — | No fix listed | CNA |
| Schneider Electric | Modicon MC80 (part numbers BMKC80) | All versions | — | No fix listed | CNA |
| Schneider Electric | Modicon Momentum Unity M1E Processor (171CBU*) | All Versions | — | No fix listed | CNA |
- Modicon M340 CPU (part numbers BMXP34*) VendorSchneider Electric Affected All versions since SV3.60 Fixed in — No fix listed CNA
- Modicon MC80 (part numbers BMKC80) VendorSchneider Electric Affected All versions Fixed in — No fix listed CNA
- Modicon Momentum Unity M1E Processor (171CBU*) VendorSchneider Electric Affected All Versions Fixed in — No fix listed CNA
CPE names CISA-ADP · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:h:schneider-electric:modicon_m340_bmxp341000:-:*:*:*:*:*:*:* | not specified by CISA-ADP | — | Schneider Electric |
| cpe:2.3:h:schneider-electric:modicon_mc80_bmkc8020301:-:*:*:*:*:*:*:* | not specified by CISA-ADP | — | Schneider Electric |
| cpe:2.3:h:schneider-electric:modicon_momentum_unity_m1e_processor:-:*:*:*:*:*:*:* | not specified by CISA-ADP | — | Schneider Electric |
- cpe:2.3:h:schneider-electric:modicon_m340_bmxp341000:-:*:*:*:*:*:*:* Versions not specified by CISA-ADP — ·Schneider Electric
- cpe:2.3:h:schneider-electric:modicon_mc80_bmkc8020301:-:*:*:*:*:*:*:* Versions not specified by CISA-ADP — ·Schneider Electric
- cpe:2.3:h:schneider-electric:modicon_momentum_unity_m1e_processor:-:*:*:*:*:*:*:* Versions not specified by CISA-ADP — ·Schneider Electric
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2024-8935
- 2026-10-03 Alias added: GHSA-6rch-pvx5-r93q
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Sources
- CVE-2024-8935 · CVE Program
- CVE-2024-8935 · NVD
- FIRST EPSS
- GHSA-6rch-pvx5-r93q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences