Is CVE-2026-4309 in the CISA KEV catalog?

No. CVE-2026-4309 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-4309?

CVE-2026-4309 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2026-4309?

CVE-2026-4309 has an EPSS score of 0.14% (4th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-4309?

Upgrade aterm wf1200cr firmware to 1.6.0 or later. Fixes are available for 8 affected products.

CVE & CISA-KEV Catalog

CVE-2026-4309

MEDIUM

6.5

CVSS v3

NVD

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.

CWE-862Missing Authorization

How to fix

Remediation Available

aterm wf1200cr firmwareNVD

Affected:< 1.6.0Fixed in:1.6.0CVE-2026-4309derived from NVD

aterm wg1200cr firmwareNVD

Affected:< 1.5.0Fixed in:1.5.0CVE-2026-4309derived from NVD

aterm wg2600hm4 firmwareNVD

Affected:< 1.4.2Fixed in:1.4.2CVE-2026-4309derived from NVD

aterm wg2600hp4 firmwareNVD

Affected:< 1.4.2Fixed in:1.4.2CVE-2026-4309derived from NVD

aterm wg2600hs2 firmwareNVD

Affected:< 1.3.2Fixed in:1.3.2CVE-2026-4309derived from NVD

aterm wg2600hs firmwareNVD

Affected:< 1.7.2Fixed in:1.7.2CVE-2026-4309derived from NVD

aterm wx1500hp firmwareNVD

Affected:< 1.4.2Fixed in:1.4.2CVE-2026-4309derived from NVD

aterm wx3000hp firmwareNVD

Affected:< 2.5.0Fixed in:2.5.0CVE-2026-4309derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Exploit Intelligence

0.14%probability of exploitation in 30 days

4thpercentile

Low risk: more likely to be exploited than 4% of all known CVEs.

References

Vendor Advisory1

jpn.nec.com

Related Vulnerabilities

Other CWE-862 (Missing Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-39226	Critical	9.8	100%	KEV	Fix
CVE-2022-0543	Critical	10.0	100%	KEV	Fix
CVE-2021-21978	Critical	9.8	99%	-	Fix
CVE-2023-52163	High	8.8	96%	KEV	-
CVE-2022-1329	High	8.8	93%	-	-
CVE-2023-6875	Critical	9.8	90%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-20.