Cyber Resilience

CVE-2026-4620

HighRCE

Published: 27 March 2026

Published
27 March 2026
Modified
20 April 2026
KEV Added
—
Patch
—
CVSS Score v4 7.1 CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0100 58.2th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-4620 is a high-severity OS Command Injection (CWE-78) vulnerability in Nec Aterm Wx3600Hp Firmware. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 41.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-4620 is an OS Command Injection vulnerability (CWE-78) in NEC Platforms, Ltd.'s Aterm Series products. Published on 2026-03-27, it carries 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), indicating critical severity due to its potential for severe impact.

The vulnerability enables a network-accessible attacker with no required privileges or user interaction to execute arbitrary OS commands on affected devices. Exploitation requires low complexity and can result in high confidentiality, integrity, and availability impacts, allowing full system compromise.

NEC Platforms has published an advisory with mitigation guidance at https://jpn.nec.com/security-info/secinfo/nv26-001_en.html.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

OS Command Injection vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to execute arbitrary OS commands via network.

CWE(s)
CWE-78

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
Why these techniques?

OS Command Injection in a public-facing network device enables unauthenticated remote exploitation (T1190) and arbitrary Unix shell command execution (T1059.004).

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

CVEs Like This One

CVE-2026-4622Same vendor: Nec
CVE-2026-4619Same product: Nec Aterm Wx3600Hp
CVE-2018-25115Shared CWE-78
CVE-2025-24382Shared CWE-78
CVE-2026-29058Shared CWE-78
CVE-2024-57016Shared CWE-78
CVE-2024-46484Shared CWE-78
CVE-2015-10145Shared CWE-78
CVE-2020-37002Shared CWE-78
CVE-2026-27848Shared CWE-78

Affected Assets

nec
aterm wx3600hp firmware
≤ 1.5.3
nec
aterm wx1500hp firmware
≤ 1.4.2

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Directly mitigates CVE-2026-4620 by requiring timely identification, reporting, and patching of the OS command injection flaw in Aterm Series products.

SI-10 Information Input Validation good match
prevent

Prevents exploitation of the command injection vulnerability by enforcing input validation at network entry points to block malicious command payloads.

SC-7 Boundary Protection partial match
prevent

Limits network-accessible exploitation of the unauthenticated command injection by monitoring and controlling communications to affected Aterm devices.

References