CVE-2025-40795: siemens simatic_pcs_neo Stack-based Buffer Overflow

Vulnerability summary

CVE-2025-40795 is a critical (CVSS 9.8) Stack-based Buffer Overflow vulnerability in siemens simatic_pcs_neo. EPSS estimates a 0.70% chance of exploitation in the next 30 days, higher than 52% of scored vulnerabilities.

Timeline

1. 09-09-2025
   PublishedVulnerability first disclosed.
2. 09-06-2026
   Last modifiedVulnerability information updated.

Description

A vulnerability has been identified in SIMATIC PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions), SIMATIC PCS neo V6.0 (All versions < V6.0 SP1 Update 1), User Management Component (UMC) (All versions < V2.15.1.3). Affected products contain a stack-based buffer overflow vulnerability in the integrated UMC component. This could allow an unauthenticated remote attacker to execute arbitrary code or to cause a denial of service condition.

• CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).