CVE-2020-26155: Utimaco Block-Safe Firmware

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Multiple files and folders in Utimaco SecurityServer 4.20.0.4 and 4.31.1.0. are installed with Read/Write permissions for authenticated users, which allows for binaries to be manipulated by non-administrator users. Additionally, entries are made to the PATH environment variable which, in conjunction with these weak permissions, could enable an attacker to perform a DLL hijacking attack.

Affected products

• Utimaco Block-Safe Firmware: version 2.0.0 only; version 3.0.0 only
• Utimaco Cryptoserver CP5 Firmware: version 5.0.0.0 only; version 5.1.0.0 only
• Utimaco Cryptoserver CP5 Vs-Nfd Firmware: version 5.1.0.0 only
• Utimaco Paymentserver Firmware: from 3.0, up to and including 4.31.0
• Utimaco Paymentserver Hybrid Firmware: from 3.0, up to and including 4.33.0
• Utimaco Securityserver Firmware: from 3.0, up to and including 4.31.1

Published 2021-03-18. Last modified 2026-06-17.