CVE-2026-4309· NVD / CVE Program· CNA NEC

Missing Authorization vulnerability in NEC Platforms, Ltd.

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

MediumCVSS 6.3 · v4.0—No exploit No fix recorded

Published: Mar 27, 2026
Updated: Jun 17, 2026
EPSS: 0.2% · 13th percentile
CWE: CWE-862

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Action score

Monitor

Low priority for now.

CVSS: 25 / 40 · 6.3 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · NEC: 6.3; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

Vendor	Product	CPE
nec	aterm wg2600hs firmware	cpe:2.3:o:nec:aterm_wg2600hs_firmware
nec	aterm wg2600hs	cpe:2.3:h:nec:aterm_wg2600hs
nec	aterm wf1200cr firmware	cpe:2.3:o:nec:aterm_wf1200cr_firmware
nec	aterm wf1200cr	cpe:2.3:h:nec:aterm_wf1200cr
nec	aterm wg1200cr firmware	cpe:2.3:o:nec:aterm_wg1200cr_firmware
nec	aterm wg1200cr	cpe:2.3:h:nec:aterm_wg1200cr
nec	aterm wg2600hp4 firmware	cpe:2.3:o:nec:aterm_wg2600hp4_firmware
nec	aterm wg2600hp4	cpe:2.3:h:nec:aterm_wg2600hp4
nec	aterm wg2600hm4 firmware	cpe:2.3:o:nec:aterm_wg2600hm4_firmware
nec	aterm wg2600hm4	cpe:2.3:h:nec:aterm_wg2600hm4
nec	aterm wg2600hs2 firmware	cpe:2.3:o:nec:aterm_wg2600hs2_firmware
nec	aterm wg2600hs2	cpe:2.3:h:nec:aterm_wg2600hs2

and 28 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

nec aterm w1200ex-ms firmwareall versions
nec aterm wf1200cr firmwarebefore 1.6.0
nec aterm wg1200cr firmwarebefore 1.5.0
nec aterm wg1200hp2 firmwareall versions
nec aterm wg1200hp3 firmwareall versions
nec aterm wg1200hp4 firmwareall versions
nec aterm wg1200hs2 firmwareall versions
nec aterm wg1200hs3 firmwareall versions
nec aterm wg1200hs4 firmwareall versions
nec aterm wg1800hp3 firmwareall versions
nec aterm wg1800hp4 firmwareall versions
nec aterm wg1900hp firmwareall versions
nec aterm wg1900hp2 firmwareall versions
nec aterm wg2600hm4 firmwarebefore 1.4.2
nec aterm wg2600hp4 firmwarebefore 1.4.2
nec aterm wg2600hs firmwarebefore 1.7.2
nec aterm wg2600hs2 firmwarebefore 1.3.2
nec aterm wx1500hp firmwarebefore 1.4.2
nec aterm wx3000hp firmwarebefore 2.5.0
nec aterm wx3600hp firmwareup to 1.5.3 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (NEC). Independent of NVD's CPE analysis and usually ahead of it.

NEC Platforms, Ltd. Aterm GB1200PE
- Before Ver. 1.3.1affected
NEC Platforms, Ltd. Aterm GX1200HP
- All versionsaffected
NEC Platforms, Ltd. Aterm GX1200HS4
- All versionsaffected
NEC Platforms, Ltd. Aterm W1200EX(-MS)
- All versionsaffected
NEC Platforms, Ltd. Aterm WF1200CR
- Before Ver. 1.6.0affected
NEC Platforms, Ltd. Aterm WG1200CR
- Before Ver. 1.5.0affected
NEC Platforms, Ltd. Aterm WG1200DM4
- All versionsaffected
NEC Platforms, Ltd. Aterm WG1200HP2
- All versionsaffected
NEC Platforms, Ltd. Aterm WG1200HP3
- All versionsaffected
NEC Platforms, Ltd. Aterm WG1200HP4
- All versionsaffected
NEC Platforms, Ltd. Aterm WG1200HS2
- All versionsaffected
NEC Platforms, Ltd. Aterm WG1200HS3
- All versionsaffected

Same product

nec: all records

Other highest-scoring records for the same primary product.

CVE-2021-20711Aterm WG2600HS firmware Ver1.5.1 and earlier allows an attacker to execute arbitrary OS commands via unspecified vectors.
39Monitor
CVE-2020-5524Aterm series (Aterm WF1200C firmware Ver1.2.1 and earlier, Aterm WG1200CR firmware Ver1.2.1 and earlier, Aterm WG2600HS firmware Ver1.3.2 an
35Monitor
CVE-2020-5534Aterm WG2600HS firmware Ver1.3.2 and earlier allows an authenticated attacker on the same network segment to execute arbitrary OS commands w
32Monitor
CVE-2020-5525Aterm series (Aterm WF1200C firmware Ver1.2.1 and earlier, Aterm WG1200CR firmware Ver1.2.1 and earlier, Aterm WG2600HS firmware Ver1.3.2 an
32Monitor
CVE-2026-4622OS Command Injection vulnerability in NEC Platforms, Ltd.
28Monitor
CVE-2020-5533Cross-site scripting vulnerability in Aterm WG2600HS firmware Ver1.3.2 and earlier allows remote attackers to inject arbitrary web script or
24Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Taizoh TsukamotoMitsui Bussan Secure Directions, Inc.reporter

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
Special conditions such as timing or configuration are required.

If successful

Confidentiality
Integrity
Availability

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: X

Weakness class (CWE)

CWE-862 · Missing Authorization

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

Exploitation of Thunderbolt Protection FlawsCAPEC-665likelihood: Low · Very High

ATT&CK techniques

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

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

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records