CVE-2018-4850

HIGH

SIMATIC S7-400 and S7-400H Firmware < 4.0, 5.0 < 5.2, < 4.5 - Denial of Service via S7 Communication Packet

Title source: llm

Description

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.

References (3)

Core 3

Core References

Vendor Advisory x_refsource_confirm

https://cert-portal.siemens.com/productcert/pdf/ssa-914382.pdf

Third Party Advisory, VDB Entry vdb-entry x_refsource_bid

http://www.securityfocus.com/bid/104217

Vendor Advisory x_refsource_confirm

https://www.siemens.com/global/en/home/products/services/cert.html#SecurityPublications

Scores

CVSS v3 7.5

EPSS 0.0051

EPSS Percentile 66.6%

Attack Vector NETWORK

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

CWE

CWE-20

Status published

Products (2)

siemens/simatic_s7-400_firmware < 4.0

siemens/simatic_s7-400h_firmware < 4.5

Published May 16, 2018

Tracked Since Feb 18, 2026