CVE-2021-34566: wago 750-8100_firmware Classic Buffer Overflow

Vulnerability summary

CVE-2021-34566 is a critical (CVSS 9.1) Classic Buffer Overflow vulnerability in wago 750-8100_firmware. EPSS estimates a 1.15% chance of exploitation in the next 30 days, higher than 66.4% of scored vulnerabilities.

Timeline

1. 09-11-2022
   PublishedVulnerability first disclosed.
2. 01-05-2025
   Last modifiedVulnerability information updated.

Description

In WAGO I/O-Check Service in multiple products an unauthenticated remote attacker can send a specially crafted packet containing OS commands to crash the iocheck process and write memory resulting in loss of integrity and DoS.

• CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.