Full Report
Siemens NX is affected by missing data validation vulnerability that could allow an attacker with local access on a compromised system to interfere with internal data during the PDF export process that could potentially lead to arbitrary code execution. Siemens has released a new version of NX which resolves the data tampering vulnerability.
Analysis Summary
# Vulnerability: Missing Data Validation in Siemens NX Leading to Potential RCE during PDF Export
## CVE Details
- CVE ID: CVE-2026-22923
- CVSS Score: 7.8 (CVSS v3.1) / 7.3 (CVSS v4.0) (High)
- CWE: CWE-121: Stack-based Buffer Overflow (Inferred from technical detail: data validation leading to ACE, often related to buffer issues)
## Affected Systems
- Products: Siemens NX
- Versions: All versions less than V2512
- Configurations: Requires local access on the compromised system.
## Vulnerability Description
The vulnerability resides in Siemens NX due to missing data validation during the internal data handling process for PDF export functionality. A locally authenticated attacker can exploit this flaw by interfering with internal data during this export operation. Successful exploitation could potentially lead to arbitrary code execution (ACE) on the affected system.
## Exploitation
- Status: Not explicitly stated if exploited in the wild, but PoC is implied via the ACE risk.
- Complexity: Based on AV:L (Local) and AC:L (for CVSS 3.1), the complexity might be low once initial system access is achieved. CVSS 4.0 lists AC:H (High), suggesting prerequisites or difficulty in triggering the payload reliably.
- Attack Vector: Local (AV:L)
## Impact
- Confidentiality: High (C:H)
- Integrity: High (I:H)
- Availability: High (A:H)
## Remediation
### Patches
- Update Siemens NX to **V2512 or a later version**.
### Workarounds
- Prioritize strong overall system hygiene (fully patched systems, robust endpoint security, continuous monitoring) to prevent initial system infection.
- Protect network access to devices with appropriate mechanisms.
- Configure the environment according to Siemens' operational guidelines for Industrial Security.
## Detection
- **Indicators of Compromise (IoC):** Specific IoCs are not detailed, but monitoring for unexpected activity related to the NX PDF export process or unauthorized file modification attempts during this action should be prioritized.
- **Detection methods and tools:** Standard endpoint security monitoring should be key, especially focusing on processes running under the context of the NX application interacting with the filesystem or performing memory operations during exports.
## References
- Vendor Advisory SA: SSA-535115 ([https://cert-portal.siemens.com/productcert/html/ssa-535115.html](https://cert-portal.siemens.com/productcert/html/ssa-535115.html))
- Siemens ProductCERT Advisories ([https://www.siemens.com/cert/advisories](https://www.siemens.com/cert/advisories))
- Siemens Industrial Security Guidelines ([https://www.siemens.com/cert/operational-guidelines-industrial-security](https://www.siemens.com/cert/operational-guidelines-industrial-security))