Auth bypass in Schneider-Electric Modicon M221
CVE-2018-7791
A Permissions, Privileges, and Access Control vulnerability exists in Schneider Electric's Modicon M221 product (all references, all versions prior to firmware V1.6.2.0). The vulnerability allows unauthorized users to overwrite the original password with their password. If an attacker exploits this vulnerability and overwrite the password, the attacker can upload the original program from the PLC.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.019 (79.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000
Affected products
- Schneider-Electric Modicon M221
- Schneider-Electric Modicon M221 Firmware
- Schneider Electric Se Modicon M221, All References, Versions Prior To Firmware V1.6.2.0 — versions Modicon M221, all references, all versions prior to firmware V1.6.2.0
Weakness classification (CWE)
References
- www.securityfocus.com/bid/105182 (VDB Entry, Third Party Advisory, vdb-entry)
- www.schneider-electric.com/en/download/document/SEVD-2018-235-01/ (Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2018-7791?
- CVE-2018-7791 is a critical-severity vulnerability in Schneider-Electric Modicon M221, classified under Improper Authentication. CVSS score: 9.8/10. Published 2018-08-29.
- How severe is CVE-2018-7791?
- Critical severity. CVSS v3 base score is 9.8 out of 10.