Improper input validation in Siemens Simatic S7-400
CVE-2018-4850
A vulnerability has been identified in SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below (All versions), SIMATIC S7-400 (incl. F) CPU hardware version 5.0 (All firmware versions < V5.2), SIMATIC S7-400H CPU hardware version 4.5 and below (All versions). The affected CPUs improperly validate S7 communication packets which could cause a Denial-of-Service condition of the CPU. The CPU will remain in DEFECT mode until manual restart.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.024 (83.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.025 · newest: 0.024 · change: -0.001
Affected products
- Siemens Simatic S7-400
- Siemens Simatic S7-400 Firmware
- Siemens Simatic S7-400h
- Siemens Simatic S7-400h Firmware
- Siemens Ag Simatic S7-400 (Incl. F) CPU Hardware Version 4.0 And Below, 5.0, S7-400h 4.5 Below — versions SIMATIC S7-400 (incl. F) CPU hardware version 4.0 and below : All versions, SIMATIC S7-400 (incl. F) CPU hardware version 5.0 : All firmware versions < V5.2, SIMATIC S7-400H CPU hardware version 4.5 and below : All versions
Weakness classification (CWE)
References
- cert-portal.siemens.com/productcert/pdf/ssa-914382.pdf (Vendor Advisory)
- www.securityfocus.com/bid/104217 (VDB Entry, Third Party Advisory, vdb-entry)
- www.siemens.com/global/en/home/products/services/cert.html (Vendor Advisory)
Frequently asked questions
- What is CVE-2018-4850?
- CVE-2018-4850 is a high-severity vulnerability in Siemens Simatic S7-400, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2018-05-16.
- How severe is CVE-2018-4850?
- High severity. CVSS v3 base score is 7.5 out of 10.