Hidden Functionality Vulnerability in NEC Aterm Series Products
CVE-2026-4621

6.3MEDIUM

Key Information:

Vendor: Nec Platforms, Ltd.
Status: Aterm W1200ex(-ms); Aterm Wg1200HP2; Aterm Wg1900HP; Aterm Wg1200hs2
Vendor: CVE Published:; 27 March 2026

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What is CVE-2026-4621?

A hidden functionality vulnerability in NEC Platforms, Ltd.'s Aterm Series products allows attackers to enable telnet connections through the network without proper authorization. This exposure could potentially lead to unauthorized access and manipulation of network services. Users are urged to update their systems and ensure appropriate security measures are in place to mitigate any associated risks.

Affected Version(s)

Aterm GB1200PE Before Ver. 1.3.1

Aterm GX1200HP All versions

Aterm GX1200HS4 All versions

References

https://jpn.nec.com/security-info/secinfo/nv26-001_en.html

CVSS V4

Score:

6.3

Severity:

MEDIUM

Confidentiality:

Low

Integrity:

Low

Availability:

Low

Attack Vector:

Network

Attack Complexity:

High

Attack Required:

None

Privileges Required:

Undefined

User Interaction:

None

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Timeline

Vulnerability published
Mar 27, 2026
Vulnerability Reserved
Mar 23, 2026

Credit

Zero Zero One Co., Ltd.

CVE-2026-4621 Data

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