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How the CVE Works:
CVE-2025-59698 targets Entrust nShield hardware security modules (HSMs), including Connect XC, 5c, and HSMi models, running firmware through versions 13.6.11 or 13.7. The vulnerability resides in the end-of-life (EOL) legacy bootloader, which remains accessible on these devices. A physically proximate attacker can exploit this by gaining physical access to the HSM’s hardware interfaces, such as serial or console ports, during the boot sequence. Upon power-up, the bootloader initializes, but insufficient authentication or validation mechanisms in the legacy code allow interruption. An attacker can use key combinations or serial commands to break into the bootloader menu, bypassing secure boot protections. This access may enable unauthorized boot mode selection, such as recovery or diagnostic modes, which are not properly locked down. From here, the attacker could load malicious firmware or extract sensitive data from memory, including cryptographic keys stored in the HSM. The exploit requires timing the physical interaction precisely during the brief boot window, often via a direct cable connection to the device’s internal ports. Since HSMs are designed to safeguard high-value keys, compromising the bootloader undermines the root of trust, potentially leading to full device compromise. The legacy bootloader was retained for backward compatibility but lacks current security patches, making it susceptible to simple physical tampering. This vulnerability highlights risks in hardware lifecycle management, where EOL components become attack vectors.
DailyCVE Form:
Platform: Entrust nShield HSM
Version: 13.6.11, 13.7
Vulnerability: Legacy Bootloader Access
Severity: Medium
Date: 12/02/2025
Prediction: Patch by 2026-01-31
What Undercode Say:
Analytics:
lsusb | grep nShield dmesg | grep ttyUSB screen /dev/ttyUSB0 115200 minicom -D /dev/ttyS0 uhsctl status nshieldcmd --check
How Exploit:
Physically connect to HSM serial port during boot, interrupt sequence with key press, access legacy bootloader menu via console, upload malicious firmware or dump memory via bootloader commands.
Protection from this CVE:
Disable legacy bootloader via firmware update, restrict physical access to devices, implement secure boot enforcement, monitor for tampering signs.
Impact:
Cryptographic key theft, HSM integrity compromise, unauthorized access to secured systems, potential data breaches.
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Sources:
Reported By: nvd.nist.gov
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