Cyber Resilience

CVE-2025-62773

Published
22 October 2025
Modified
15 April 2026
CVSS Score v3.1 2.4
Click a component to see what it means
Raw vectorCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
EPSS Score 0.0016 6th percentile
Risk Priority 15 floored blend · peak EPSS

Summary

CVE-2025-62773 is a low-severity Hidden Functionality (CWE-912) vulnerability in Nullvoid (inferred from references). Its CVSS base score is 2.4 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique SSH (T1021.004); ranked at the 6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to AC-17 (Remote Access) and CM-7 (Least Functionality) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Mercku M6a devices through 2.1.0 allow TELNET sessions via a router.telnet.enabled.update request by an administrator.

CWE(s)
CWE-912

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1021.004 SSH Lateral Movement
Adversaries may use [Valid Accounts](https://attack.
attack.mitre.org →
Why these techniques?

The vulnerability explicitly enables TELNET access on the device via an administrative request, directly mapping to Remote Services (SSH) technique T1021.004 which covers remote access protocols including TELNET.

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

CVEs Like This One

CVE-2023-24108Shared CWE-912
CVE-2026-31847Shared CWE-912
CVE-2026-33280Shared CWE-912
CVE-2023-4467Shared CWE-912
CVE-2026-4621Shared CWE-912
CVE-2024-37990Shared CWE-912
CVE-2026-1741Shared CWE-912
CVE-2025-26412Shared CWE-912
CVE-2026-1952Shared CWE-912
CVE-2025-6839Shared CWE-912

Affected Assets

Nullvoid
—
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • CM-7 Least Functionality
  • AC-17 Remote Access
  • SC-8 Transmission Confidentiality and Integrity
Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

CM-7 Least Functionality good match
prevent

Directly prohibits enabling unnecessary and insecure services such as Telnet on the device.

AC-17 Remote Access good match
prevent

Restricts remote access methods and explicitly disallows insecure clear-text protocols like Telnet.

SC-8 Transmission Confidentiality and Integrity partial match
prevent

Requires confidentiality and integrity protections for transmitted data, which Telnet inherently lacks.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 full match
prevents

Secure SDLC practices directly prevent introduction of undocumented hidden functionality during development.

ID.RA-09 mostly match
prevents

Pre-acquisition integrity/authenticity checks can detect undocumented hidden functions in supplied software/hardware.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
detects

Security testing in development and acceptance can discover undocumented functionality before release.

A.8.32 Change management mostly match
prevents

Change management processes can catch unauthorized additions but do not inherently prevent hidden functionality from being introduced.

A.8.16 Monitoring activities partial match
detects

Monitoring activities can detect anomalous behavior from hidden functions but do not eliminate the weakness.

A.8.25 Secure development life cycle partial match
prevents

Secure development life cycle mandates documented requirements and design reviews that would expose undocumented hidden functionality.

A.8.26 Application security requirements partial match
prevents

Application security requirements explicitly define expected functionality, making hidden features a violation.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure system architecture and engineering principles require transparent, documented designs that preclude hidden functionality.

References