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CVE-2021-27399

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-08 · updated 2026-06-17
• Weakness: CWE-787

Description

A vulnerability has been identified in Simcenter Femap 2020.2 (All versions < V2020.2.MP3), Simcenter Femap 2021.1 (All versions < V2021.1.MP3). The femap.exe application lacks proper validation of user-supplied data when parsing FEMAP files. This could result in an out of bounds write past the end of an allocated structure, a different vulnerability than CVE-2021-27387. An attacker could leverage this vulnerability to execute code in the context of the current process. (ZDI-CAN-12820)

Affected products

• Siemens Simcenter Femap: before 2020.2; 2020.2, 2020.2-maintenance_pack1, 2020.2-maintenance_pack2, 2021.1, 2021.1-maintenance_pack1, 2021.1-maintenance_pack2 — fixed in 2020.2

How to fix

Upgrade to a fixed version: Siemens Simcenter Femap 2020.2. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-133038.pdf
• https://www.zerodayinitiative.com/advisories/ZDI-21-781/
• https://cert-portal.siemens.com/productcert/pdf/ssa-133038.pdf
• https://www.zerodayinitiative.com/advisories/ZDI-21-781/

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