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Siemens issued a security advisory (SSA-047424) for two serious vulnerabilities—CVE-2025-26389 and CVE-2025-26390—impacting the OZW672 and OZW772 web servers. These servers are commonly used for remote monitoring and controlling building systems like heating and air conditioning. Both vulnerabilities can be exploited without authentication, potentially compromising the entire system.
“OZW672 and OZW772 Web Server versions contain vulnerabilities that could allow an attacker to execute arbitrary code on the device with root privileges… or to authenticate as Administrator user,” Siemens warned.
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The security advisory details two flaws:
CVE-2025-26389 : OS Command Injection (CVSS 10.0): A vulnerability in the exportDiagramPage function lets an unauthenticated remote attacker run OS commands with full system access.
CVE-2025-26390: SQL Injection (CVSS 9.8): A flaw in the login system could let an attacker skip login and access Administrator rights.
The affected products and the corresponding remediation are as follows:
OZW672:
All versions < V8.0 are affected by CVE-2025-26389: Update to V8.0 or later.
All versions < V6.0 are affected by CVE-2025-26390: Update to V6.0 or later.
OZW772:
All versions < V8.0 are affected by CVE-2025-26389: Update to V8.0 or later.
All versions < V6.0 are affected by CVE-2025-26390: Update to V6.0 or later.
Siemens urges users to update to the latest versions to mitigate these vulnerabilities.
In addition to patching, Siemens strongly recommends:
Restricting network access to affected web servers
Deploying devices in protected IT environments
Following Siemens’ general security practices, including hardening the web interface and limiting accessible IPs
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