What is CVE-2026-4621?

CVE-2026-4621 is a medium-severity vulnerability in Nec Aterm W1200ex-Ms, classified under Hidden Functionality. CVSS score: 5.6/10. Published 2026-03-27.

How severe is CVE-2026-4621?

Medium severity. CVSS v3 base score is 5.6 out of 10.

Vulnerability in Nec Aterm W1200ex-Ms

CVE-2026-4621

Hidden Functionality vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to enable telnet via network.

EPSS: 0.002 (5.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Nec Aterm_w1200ex-ms
Nec Aterm_w1200ex-ms_firmware
Nec Aterm_wf1200cr
Nec Aterm_wf1200cr_firmware
Nec Aterm_wg1200cr
Nec Aterm_wg1200cr_firmware
Nec Aterm_wg1200hp2
Nec Aterm_wg1200hp2_firmware
Nec Aterm_wg1200hp3
Nec Aterm_wg1200hp3_firmware

Weakness classification (CWE)

CWE-912 — Hidden Functionality

References

psirt-info@cyber.jp.nec.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-4621?: CVE-2026-4621 is a medium-severity vulnerability in Nec Aterm W1200ex-Ms, classified under Hidden Functionality. CVSS score: 5.6/10. Published 2026-03-27.
How severe is CVE-2026-4621?: Medium severity. CVSS v3 base score is 5.6 out of 10.