CISA 2026-04-21

Siemens SINEC NMS

CVE-2026-24032

Machine-generated analysis · WAYSCloud LLM

The advisory notes that this vulnerability affects critical manufacturing infrastructure. The issue is an authentication bypass in the User Management Component (UMC) due to insufficient identity validation.

Context

Siemens SINEC NMS is a network management system used in critical manufacturing. The advisory states that an unauthenticated remote attacker could bypass authentication and gain unauthorized access. The vulnerability is specifically tied to the User Management Component and is assigned CWE-347 (Improper Verification of Cryptographic Signature).

Operator considerations

Check: Inventory SINEC NMS instances with User Management Component
Isolate: Restrict network access to SINEC NMS as recommended by Siemens
Patch: Update to V4.0 SP3 or later
Log: Monitor for unauthorized access attempts or authentication bypass patterns

From Cybersecurity and Infrastructure Security Agency ↗

Siemens SINEC NMS when used with User Management Component (UMC) contains an authentication bypass vulnerability due to insufficient validation of user identity. This could allow an unauthenticated remote attacker to bypass authentication and gain unauthorized access to the application. Siemens has released a new version for SINEC NMS and recommends to update to the latest version.

The following versions of Siemens SINEC NMS are affected:

SINEC NMS

Vendor

Equipment

Siemens

Siemens SINEC NMS

Improper Verification of Cryptographic Signature

Critical Infrastructure Sectors: Critical Manufacturing

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany

The affected application contains an authentication weakness due to insufficient validation of user identity in the UMC component. This could allow an unauthenticated remote attacker to bypass authentication an...

Read the full advisory on CISA →