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% (13th 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% (13th 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 →

Other CWE-862 (Missing Authorization) vulnerabilities

• CVE-2026-101000 — Critical (CVSS 10.0): A vulnerability was determined in Netcore NBR100V2 1.3.240614.030928. This affects the function uci.apply of the file…
• CVE-2026-97360 — Critical (CVSS 10.0): HFS2 version 2.4.0 and earlier contains an unauthenticated arbitrary file access vulnerability that allows…
• CVE-2026-65381 — Critical (CVSS 10.0): A validation issue existed in the entitlement verification. This issue was addressed with improved validation of the…
• CVE-2026-81648 — Critical (CVSS 10.0): The CryptoPayment Gateway WordPress plugin from 1.2.1 to 1.2.2 does not apply an authorization check on one of its AJAX…
• CVE-2026-77770 — Critical (CVSS 10.0): The miniOrange 2FA WordPress plugin before 6.3.1, miniOrange 2FA WordPress plugin before 19.3 does not require a…
• CVE-2026-65667 — Critical (CVSS 10.0): Missing authorization in Microsoft Teams allows an unauthorized attacker to elevate privileges over a network.

Browse all CWE-862 (Missing Authorization) vulnerabilities →