How severe is CVE-2026-4622?

CVE-2026-4622 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-4622 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4622?

CVE-2026-4622 primarily affects Nec Aterm Wg2600hs Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-4622?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-4622 have an EU (EUVD) identifier?

Yes. CVE-2026-4622 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16591.

When was CVE-2026-4622 published?

CVE-2026-4622 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-4622

CVE-2026-4622 is a critical-severity vulnerability in Nec Aterm Wg2600hs Firmware with a CVSS 3.x base score of 9.8. 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 7.1
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16591
Weakness: CWE-78
Affected product: Nec Aterm Wg2600hs Firmware
Published: 2026-03-27
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2026-4622?: OS Command Injection vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to execute arbitrary OS commands via network.
How severe is CVE-2026-4622?: CVE-2026-4622 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-4622 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4622?: CVE-2026-4622 primarily affects Nec Aterm Wg2600hs Firmware. In total, 9 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-4622?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-4622 have an EU (EUVD) identifier?: Yes. CVE-2026-4622 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16591.
When was CVE-2026-4622 published?: CVE-2026-4622 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 (9)

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_wx3000hp2_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_gb1200pe_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Nec Aterm Wg2600hs Firmware

CVE-2021-20711 — Critical (CVSS 9.8): Aterm WG2600HS firmware Ver1.5.1 and earlier allows an attacker to execute arbitrary OS commands via unspecified…
CVE-2020-5524 — High (CVSS 8.8): Aterm series (Aterm WF1200C firmware Ver1.2.1 and earlier, Aterm WG1200CR firmware Ver1.2.1 and earlier, Aterm WG2600HS…
CVE-2020-5534 — High (CVSS 8.0): Aterm WG2600HS firmware Ver1.3.2 and earlier allows an authenticated attacker on the same network segment to execute…
CVE-2020-5525 — High (CVSS 8.0): Aterm series (Aterm WF1200C firmware Ver1.2.1 and earlier, Aterm WG1200CR firmware Ver1.2.1 and earlier, Aterm WG2600HS…
CVE-2021-20709 — High (CVSS 7.2): Improper validation of integrity check value vulnerability in NEC Aterm WF1200CR firmware Ver1.3.2 and earlier, Aterm…
CVE-2021-20708 — High (CVSS 7.2): NEC Aterm devices (Aterm WF1200CR firmware Ver1.3.2 and earlier, Aterm WG1200CR firmware Ver1.3.3 and earlier, and…

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