Out-of-bounds Read in Schneider-Electric Modicon M340
CVE-2018-7843
A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause denial of service when reading memory blocks with an invalid data size or with an invalid data offset in the controller over Modbus.
Vulnerability class: Buffer Overflow
EPSS: 0.033 (87.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Schneider-electric Modicon_m340
- Schneider-electric Modicon_m340_firmware
- Schneider-electric Modicon_m580
- Schneider-electric Modicon_m580_firmware
- Schneider-electric Modicon_premium
- Schneider-electric Modicon_premium_firmware
- Schneider-electric Modicon_quantum
- Schneider-electric Modicon_quantum_firmware
- N/a Modicon M580 M340 Quantum Premium — versions Modicon M580 Modicon M340 Modicon Quantum Modicon Premium
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cybersecurity@se.com (x_refsource_MISC, Vendor Advisory)
- cybersecurity@se.com (Exploit, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2018-7843?
- CVE-2018-7843 is a high-severity vulnerability in Schneider-Electric Modicon M340, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2019-05-22.
- How severe is CVE-2018-7843?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2018-7843 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.