How severe is CVE-2026-4621?

CVE-2026-4621 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-4621 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4621?

CVE-2026-4621 primarily affects Nec Aterm Wg1200hp4 Firmware. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-4621?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-4621 have an EU (EUVD) identifier?

Yes. CVE-2026-4621 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16589.

When was CVE-2026-4621 published?

CVE-2026-4621 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-4621

CVE-2026-4621 is a medium-severity vulnerability in Nec Aterm Wg1200hp4 Firmware with a CVSS 3.x base score of 5.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-912.

Key facts

Severity: Medium (CVSS 3.x base score 5.6)
CVSS v4: 6.3
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16589
Weakness: CWE-912
Affected product: Nec Aterm Wg1200hp4 Firmware
Published: 2026-03-27
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-4621?: Hidden Functionality vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to enable telnet via network.
How severe is CVE-2026-4621?: CVE-2026-4621 has a CVSS 3.x base score of 5.6, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-4621 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4621?: CVE-2026-4621 primarily affects Nec Aterm Wg1200hp4 Firmware. In total, 21 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-4621?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4621 have an EU (EUVD) identifier?: Yes. CVE-2026-4621 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16589.
When was CVE-2026-4621 published?: CVE-2026-4621 was published on 2026-03-27 and last updated on 2026-06-17.

References

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

Affected products (21)

cpe:2.3:o:nec:aterm_wg1200hp4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg2600hs_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wf1200cr_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1200cr_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg2600hp4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg2600hm4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg2600hs2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wx3000hp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wx3600hp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_w1200ex-ms_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1200hp2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1900hp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1200hs2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1800hp3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1200hp3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1900hp2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1200hs3_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1800hp4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1200hs4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wx1500hp_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wx3000hp2_firmware:*:*:*:*:*:*:*:*

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