CVE-2025-67112

Critical

Published: 19 March 2026

Published

19 March 2026

Modified

24 March 2026

KEV Added

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Patch

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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0015 34.5th percentile

Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-67112 is a critical-severity Use of Hard-coded Cryptographic Key (CWE-321) vulnerability in Fcc (inferred from references). Its CVSS base score is 9.8 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 34.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SC-12 (Cryptographic Key Establishment and Management) and SC-28 (Protection of Information at Rest).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploitation for Privilege Escalation (T1068) and 2 other techniques. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SC-12 Cryptographic Key Establishment and Management good match

prevent

Mandates proper cryptographic key establishment and management, directly preventing the use of hard-coded keys in the configuration backup/restore encryption.

SI-2 Flaw Remediation good match

prevent

Requires timely identification, reporting, and remediation of flaws like the hard-coded key vulnerability through firmware upgrades.

SC-28 Protection of Information at Rest good match

prevent

Implements cryptographic protections for information at rest such as device configurations, preventing unauthorized decryption, modification, and re-encryption.

MITRE ATT&CK Enterprise TechniquesAI

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

T1098 Account Manipulation Persistence

Adversaries may manipulate accounts to maintain and/or elevate access to victim systems.

attack.mitre.org →

T1602.002 Network Device Configuration Dump Collection

Adversaries may access network configuration files to collect sensitive data about the device and the network.

attack.mitre.org →

Why these techniques?

The vulnerability directly enables network device configuration dumping (T1602.002) via decryption of backups with a hard-coded key, account/credential manipulation (T1098) by modifying sensitive data in configs, and exploitation for privilege escalation (T1068).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

Use of a hard-coded AES-256-CBC key in the configuration backup/restore implementation of Small Cell Sercomm SCE4255W (FreedomFi Englewood) firmware before DG3934v3@2308041842 allows remote authenticated users to decrypt, modify, and re-encrypt device configurations, enabling credential manipulation and privilege escalation via the…

GUI import/export functions.

Deeper analysisAI

CVE-2025-67112 is a critical vulnerability involving the use of a hard-coded AES-256-CBC key in the configuration backup and restore implementation of the Small Cell Sercomm SCE4255W (FreedomFi Englewood) firmware versions prior to DG3934v3@2308041842. This flaw, classified under CWE-321 (Use of Hard-coded Cryptographic Key), has a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) and was published on 2026-03-19.

Remote authenticated users can exploit this vulnerability by leveraging the GUI import/export functions to decrypt device configurations, modify sensitive data such as credentials, re-encrypt the configurations, and then restore them. Successful exploitation enables credential manipulation and privilege escalation on the affected device.

Mitigation requires upgrading to firmware version DG3934v3@2308041842 or later. Additional details are available in related advisories and documentation, including the FCC report at https://fcc.report/FCC-ID/P27-SCE4255W/4790935.pdf, the FreedomFi website at https://freedomfi.com/index.html, and a technical blog post at https://neroteam.com/blog/freedomfi-sercomm-sce4255w-englewood.