How severe is CVE-2026-4309?

CVE-2026-4309 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-4309 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4309?

CVE-2026-4309 primarily affects Nec Aterm Wg2600hs Firmware. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-4309?

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

Does CVE-2026-4309 have an EU (EUVD) identifier?

Yes. CVE-2026-4309 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16583.

When was CVE-2026-4309 published?

CVE-2026-4309 was published on 2026-03-27 and last updated on 2026-06-17.

CVE-2026-4309

CVE-2026-4309 is a medium-severity vulnerability in Nec Aterm Wg2600hs Firmware with a CVSS 3.x base score of 6.5. 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-862.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 6.3
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16583
Weakness: CWE-862
Affected product: Nec Aterm Wg2600hs Firmware
Published: 2026-03-27
Last modified: 2026-06-17

Description

Missing Authorization vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to get a specific device information and change the settings via network.

Frequently asked questions

What is CVE-2026-4309?: Missing Authorization vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to get a specific device information and change the settings via network.
How severe is CVE-2026-4309?: CVE-2026-4309 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-4309 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4309?: CVE-2026-4309 primarily affects Nec Aterm Wg2600hs Firmware. In total, 20 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-4309?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-4309 have an EU (EUVD) identifier?: Yes. CVE-2026-4309 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16583.
When was CVE-2026-4309 published?: CVE-2026-4309 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 (20)

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_wg1200hp4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wg1200hs4_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:nec:aterm_wx1500hp_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Nec Aterm Wg2600hs Firmware

CVE-2026-4622 — Critical (CVSS 9.8): OS Command Injection vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to execute arbitrary OS…
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…

All CVEs affecting Nec Aterm Wg2600hs Firmware →

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