CVE-2026-25656
Siemens Sinec Nms
Raw vector
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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:XCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2026-25656 is a high-severity Uncontrolled Search Path Element (CWE-427) vulnerability in Siemens Sinec Nms. Its CVSS base score is 8.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Path Interception (T1034); ranked at the 15th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified map to CM-6 (Configuration Settings) and AC-3 (Access Enforcement) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2026-25656 affects SINEC NMS in all versions prior to V4.0 SP3 and the User Management Component (UMC) in all versions prior to V2.15.2.1. The vulnerability stems from improper modification of a configuration file by a low-privileged user (CWE-427), enabling the loading of malicious DLLs. This can potentially lead to arbitrary code execution with SYSTEM privileges. It carries a CVSS v3.1 base score of 7.8 (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) and was published on 2026-02-10.
A low-privileged local user can exploit the issue by altering the configuration file to reference a malicious DLL, requiring low attack complexity with no user interaction. Successful exploitation grants arbitrary code execution at SYSTEM privilege level, resulting in high impacts to confidentiality, integrity, and availability.
Siemens has published security advisory SSA-311973 at https://cert-portal.siemens.com/productcert/html/ssa-311973.html, which details the vulnerability and associated mitigations. The issue is canonically reported as ZDI-CAN-28108.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-6890
Vulnerability Data
A vulnerability has been identified in SINEC NMS (All versions < V4.0 SP3), User Management Component (UMC) (All versions < V2.15.2.1). The affected application permits improper modification of a configuration file by a low-privileged user. This could allow an attacker…
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to load malicious DLLs, potentially leading to arbitrary code execution with SYSTEM privileges.(ZDI-CAN-28108)
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise Techniques
CVEs Like This One
Affected Assets
Mitigating Controls
Control response
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- 2 hardening rules · 1 OS baseline
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Mitigating Controls (NIST 800-53 r5) AI
Establishes restrictive configuration settings that can define and lock down approved search paths.
Enforces approved authorizations so that only intended actors can place or modify elements in the search path.
Limits privileges so unintended actors cannot write to or control directories in the product's search path.
Restricts logical and physical access to change system configuration, including search-path settings and directories.
Mitigating Controls (NIST CSF 2.0) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.
Secure-development practices directly address design of search paths and resource loading.
Hardened configuration baselines can enforce safe search-path settings and reduce exposure.
Execution allow-listing can block malicious binaries placed in hijackable search locations.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Security testing can detect uncontrolled search-path issues but does not prevent them by itself.
Restricting software installation reduces the chance that an attacker-controlled path element is introduced into the search path.
Secure system architecture and engineering principles require explicit control over search paths and resource locations.
Secure coding practices directly address the use of fixed or controlled search paths that can be influenced by unintended actors.
Configuration management can enforce approved search-path settings but does not inherently prevent the weakness.
Hardening callouts derived
Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).
Oracle Linux 8 (1 rule)
- V-248577 OL 8 must enable kernel parameters to enforce Discretionary Access Control (DAC) on symlinks. prevents CWE-427