What’s Vulnerable › Vulnerabilities

CVE-2021-27396

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-05-12 · updated 2026-06-17
• Weakness: CWE-121

Description

A vulnerability has been identified in Tecnomatix Plant Simulation (All versions < V16.0.5). The PlantSimCore.dll library lacks proper validation of user-supplied data when parsing SPP files. This could result in a stack based buffer overflow, a different vulnerability than CVE-2021-27398. An attacker could leverage this vulnerability to execute code in the context of the current process. (ZDI-CAN-13279)

Affected products

• Siemens Tecnomatix Plant Simulation: before 16.0.5 — fixed in 16.0.5

How to fix

Upgrade to a fixed version: Siemens Tecnomatix Plant Simulation 16.0.5. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-983548.pdf
• https://www.zerodayinitiative.com/advisories/ZDI-21-568/
• https://cert-portal.siemens.com/productcert/pdf/ssa-983548.pdf
• https://www.zerodayinitiative.com/advisories/ZDI-21-568/

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