Platform
siemens
Component
siemens-sinec-nms
Fixed in
4.0 SP3
CVE-2026-24032 describes an authentication bypass vulnerability discovered in SINEC NMS, affecting versions prior to V4.0 SP3 that utilize the UMC component. This flaw allows an unauthenticated remote attacker to circumvent authentication mechanisms and potentially gain unauthorized access to the system. A patch is available in version V4.0 SP3, addressing this critical security concern.
Successful exploitation of CVE-2026-24032 could grant an attacker complete control over the SINEC NMS system. This could lead to unauthorized modification of configurations, disruption of industrial processes, and potential data breaches. Given that SINEC NMS is often deployed in critical infrastructure environments, the impact could extend beyond the immediate system, potentially affecting broader operational capabilities. The lack of authentication validation means an attacker doesn't need any credentials to exploit this vulnerability, significantly increasing the risk of compromise.
CVE-2026-24032 was publicly disclosed on 2026-04-14. The vulnerability is tracked by CISA and may be added to the KEV catalog depending on observed exploitation activity. Public proof-of-concept exploits are not currently available, but the ease of exploitation due to the authentication bypass makes it a high-priority vulnerability. The ZDI-CAN-27564 identifier suggests this vulnerability was reported through a coordinated disclosure program.
Exploit Status
EPSS
0.04% (11% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2026-24032 is to upgrade SINEC NMS to version V4.0 SP3 or later, which includes the necessary authentication validation fixes. If an immediate upgrade is not feasible, consider implementing network segmentation to isolate the SINEC NMS system from untrusted networks. Restrict access to the UMC component to only authorized personnel. Monitor network traffic for suspicious activity targeting the UMC interface. After upgrading, verify the authentication mechanism by attempting to access the UMC component without valid credentials to confirm the fix.
Update SINEC NMS to version 4.0 SP3 or later to mitigate the authentication vulnerability. Refer to security advisory SSA-801704 on the Siemens certification portal for more details and mitigation instructions.
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CVE-2026-24032 is a HIGH severity vulnerability in SINEC NMS versions 0.0.0–V4.0 SP3 with UMC, allowing unauthenticated attackers to bypass authentication and gain unauthorized access.
You are affected if you are running SINEC NMS versions 0.0.0 through V4.0 SP3 that utilize the UMC component. Upgrade to V4.0 SP3 to mitigate the risk.
Upgrade SINEC NMS to version V4.0 SP3 or later. As a temporary workaround, restrict access to the UMC component and implement network segmentation.
While no active exploitation has been publicly confirmed, the ease of exploitation makes it a high-priority vulnerability and potential target.
Refer to the official SINEC NMS security advisories on the Siemens website for detailed information and updates regarding CVE-2026-24032.
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