Local Privilege Escalation via Uncontrolled Search Path / DLL Hijacking in Siemens SINEC NMS (< V4.0 SP2)
CVE-2026-25655 is a local privilege escalation vulnerability in Siemens SINEC NMS affecting all versions prior to V4.0 SP2. The application permits a low-privileged local user to improperly modify a configuration file (noted in reporting as related to OpenSSL configuration being loaded from an unsecured location), which can influence DLL loading behavior (uncontrolled search path element). By tampering with this configuration, an attacker can cause SINEC NMS to load an attacker-controlled malicious DLL, resulting in arbitrary code execution in an elevated context (administrative privileges). The issue is associated with ZDI-CAN-28107.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unknown (CVE referenced in an ICS advisory summary for Siemens SINEC NMS).
Local privilege escalation in Siemens SINEC NMS via configuration tampering that enables DLL search order hijacking (uncontrolled search path), leading to elevated arbitrary code execution.
A local privilege escalation / arbitrary code execution issue in Siemens SINEC NMS where a low-privileged user can improperly modify a configuration file to influence DLL loading, potentially resulting in execution of malicious DLLs with administrative privileges (CWE-427).
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.