What is CVE-2025-59699?

CVE-2025-59699 is a medium-severity vulnerability in Entrust Nshield 5c, classified under Authentication Bypass by Spoofing. CVSS score: 6.8/10. Published 2025-12-02.

How severe is CVE-2025-59699?

Medium severity. CVSS v3 base score is 6.8 out of 10.

Vulnerability in Entrust Nshield 5c

CVE-2025-59699

Entrust nShield Connect XC, nShield 5c, and nShield HSMi through 13.6.11, or 13.7 (patched in 13.6.12 (LTS) and 13.9.0 (STS)), allow a physically proximate attacker to escalate privileges by booting from a USB device with a valid root filesystem. This occurs because of insecure default settings in the Legacy GRUB Bootloader.

Published 2025-12-02 · last modified 2026-08-26.

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (24.6th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-290 — Authentication Bypass by Spoofing

References

www.entrust.com/use-case/why-use-an-hsm (Product)
github.com/google/security-research/security/advisories/GHSA-6q4x-m86j-gfwj (Exploit, Third Party Advisory)
www.entrust.com/knowledgebase/hardware/understanding-nshield-security-advisory-…
github.com/advisories/GHSA-g9v7-h8x8-w5vw

Frequently asked questions

What is CVE-2025-59699?: CVE-2025-59699 is a medium-severity vulnerability in Entrust Nshield 5c, classified under Authentication Bypass by Spoofing. CVSS score: 6.8/10. Published 2025-12-02.
How severe is CVE-2025-59699?: Medium severity. CVSS v3 base score is 6.8 out of 10.