Auth bypass in Wago 750-362

CVE-2021-34578

This vulnerability allows an attacker who has access to the WBM to read and write settings-parameters of the device by sending specifically constructed requests without authentication on multiple WAGO PLCs in firmware versions up to FW07.

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: 0.010 (61.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 62nd percentile — 61.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2021-34578: held from 0.010 to 0.010.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2021-34578?
CVE-2021-34578 is a critical-severity vulnerability in Wago 750-362, classified under Improper Authentication. CVSS score: 9.8/10. Published 2021-08-31.
How severe is CVE-2021-34578?
Critical severity. CVSS v3 base score is 9.8 out of 10.