Is CVE-2025-59695 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2025-59695 being exploited in the wild.

How severe is CVE-2025-59695?

Critical severity, with a CVSS score of 9.8, published 2 December 2025.

Which products and versions are affected?

Entrust nShield Connect XC through 13.6.11, 13.7 (patched in 13.6.12, 13.9.0); Entrust Nshield 5c through 13.6.11, 13.7 (patched in 13.6.12, 13.9.0); Entrust Nshield Hsmi through 13.6.11, 13.7 (patched in 13.6.12, 13.9.0).

Is there a fix for CVE-2025-59695?

A patch was published on 2025: Patched in nShield 13.6.12 (LTS) and 13.9.0 (STS) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2025-59695 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2025-59695?

Check whether you run Entrust nShield Connect XC, Entrust Nshield 5c or Entrust Nshield Hsmi at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2025-59695: Entrust nShield Connect XC firmware modification without authentication

CVE-2025-59695 · Severity: critical · CVSS 9.8 · Published 2025-12-02

Entrust nShield hardware security modules (HSMs) are cryptographic appliances that protect critical encryption keys used by financial institutions and enterprises. A vulnerability allows users with administrative access to modify the Chassis Management Board firmware without any authentication checks, potentially enabling persistent backdoors or disabling security protections on the device.

Technologies: Entrust nShield Connect XC, Entrust Nshield 5c, Entrust Nshield Hsmi. Vendors: Entrust.

Quick answers

Is CVE-2025-59695 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2025-59695 being exploited in the wild.
How severe is CVE-2025-59695?: Critical severity, with a CVSS score of 9.8, published 2 December 2025.
Which products and versions are affected?: Entrust nShield Connect XC through 13.6.11, 13.7 (patched in 13.6.12, 13.9.0); Entrust Nshield 5c through 13.6.11, 13.7 (patched in 13.6.12, 13.9.0); Entrust Nshield Hsmi through 13.6.11, 13.7 (patched in 13.6.12, 13.9.0).
Is there a fix for CVE-2025-59695?: A patch was published on 2025: Patched in nShield 13.6.12 (LTS) and 13.9.0 (STS) Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2025-59695 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2025-59695?: Check whether you run Entrust nShield Connect XC, Entrust Nshield 5c or Entrust Nshield Hsmi at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This is a missing authentication vulnerability (CWE-306) in the Chassis Management Board (Cosmo) firmware upgrade mechanism on Entrust nShield appliances. An attacker with OS-level root access can invoke the cosmoupgrade utility to arbitrarily modify the Cosmo firmware without presenting any credentials. While the upgrade process validates the firmware version number and CRC, it does not authenticate the requester, allowing privileged local users to permanently compromise the device. Once root access is obtained (via separate physical or logical attack), this vulnerability enables persistent firmware backdoors that cannot be detected by the appliance or end-user, disable tamper event logging, and compromise the entire boot chain. Patches are available in nShield 13.6.12 (LTS) and 13.9.0 (STS).

Affected products

Entrust nShield Connect XC through 13.6.11, 13.7 (patched in 13.6.12, 13.9.0)
Entrust nShield 5c through 13.6.11, 13.7 (patched in 13.6.12, 13.9.0)
Entrust nShield HSMi through 13.6.11, 13.7 (patched in 13.6.12, 13.9.0)

Timeline

2025-12-02: disclosed: CVE-2025-59695 published
2025: patched: Patched in nShield 13.6.12 (LTS) and 13.9.0 (STS)

References

https://github.com/google/security-research/security/advisories/GHSA-6q4x-m86j-gfwj

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