Review reviewCritical

CVE-2026-4769

WAGO 0765-110x/0100-0000, 0765-120x/0100-0000, 0765-150x/0100-0000

Certain devices in the WAGO System I/O Field series activate an internal diagnostic capability during the initial startup sequence. This functionality is not formally documented and becomes accessible without authentication for a brief period in the early boot phase. During this window, an unauthenticated remote attacker can gain access to the internal system processes, resulting in full system compromise.

CVSS: 9.3
EPSS: 0.45%
CISA KEV: Not listed
Published: 2026.07.13

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.45%

Technical severityCVSS 9.3

Vulnerability overview

Affected product and versions

Product: WAGO 0765-110x/0100-0000, 0765-120x/0100-0000, 0765-150x/0100-0000
Affected versions: >= 1.0.0.0 < 1.2.1.100, >= 1.0.0.0 < 1.2.7.100, >= 1.0.0.0 < 1.2.7.103, >= 1.0.0.0 < 1.2.1.102, >= 1.0.0.0 < 1.2.5.101
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that WAGO 0765-110x/0100-0000, 0765-120x/0100-0000, 0765-150x/0100-0000 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE: CWE-912