CVE-2026-4621 (GCVE-0-2026-4621)

Vulnerability from cvelistv5 – Published: 2026-03-27 11:52 – Updated: 2026-04-10 04:13
VLAI
Summary
Hidden Functionality vulnerability in NEC Platforms, Ltd. Aterm Series allows a attacker to enable telnet via network.
Severity
6.3 (Medium)
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-27 12:57 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
NEC Platforms, Ltd. Aterm W1200EX(-MS) Affected: All versions
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NEC Platforms, Ltd. Aterm WG1200HP2 Affected: All versions
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NEC Platforms, Ltd. Aterm WG1900HP Affected: All versions
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NEC Platforms, Ltd. Aterm WG1200HS2 Affected: All versions
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NEC Platforms, Ltd. Aterm WG1800HP3 Affected: All versions
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NEC Platforms, Ltd. Aterm WG1200HP3 Affected: All versions
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NEC Platforms, Ltd. Aterm WG1900HP2 Affected: All versions
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NEC Platforms, Ltd. Aterm WG1200HS3 Affected: All versions
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NEC Platforms, Ltd. Aterm WG1800HP4 Affected: All versions
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NEC Platforms, Ltd. Aterm WG1200HP4 Affected: All versions
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NEC Platforms, Ltd. Aterm WG1200HS4 Affected: All versions
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NEC Platforms, Ltd. Aterm WX1500HP Affected: Before Ver. 1.4.2
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NEC Platforms, Ltd. Aterm WG2600HS Affected: Before Ver. 1.7.2
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NEC Platforms, Ltd. Aterm WF1200CR Affected: Before Ver. 1.6.0
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NEC Platforms, Ltd. Aterm WG1200CR Affected: Before Ver. 1.5.0
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NEC Platforms, Ltd. Aterm WG2600HP4 Affected: Before Ver. 1.4.2
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NEC Platforms, Ltd. Aterm WG2600HM4 Affected: Before Ver. 1.4.2
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NEC Platforms, Ltd. Aterm WG2600HS2 Affected: Before Ver. 1.3.2
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NEC Platforms, Ltd. Aterm WX3000HP Affected: Before Ver. 2.5.0
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NEC Platforms, Ltd. Aterm WX3000HP2 Affected: Before Ver. 1.3.2
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NEC Platforms, Ltd. Aterm WX3600HP Affected: Before Ver. 1.4.2
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NEC Platforms, Ltd. Aterm GX1200HP Affected: All versions
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NEC Platforms, Ltd. Aterm GX1200HS4 Affected: All versions
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NEC Platforms, Ltd. Aterm WG1200DM4 Affected: All versions
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NEC Platforms, Ltd. Aterm GB1200PE Affected: Before Ver. 1.3.1
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Credits
Chuya Hayakawa of Zero Zero One Co., Ltd.
Show details on NVD website
To clipboard 

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              "vendor": "NEC Platforms, Ltd.",
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              "vendor": "NEC Platforms, Ltd.",
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                  "status": "affected",
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                }
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            },
            {
              "defaultStatus": "unknown",
              "product": "Aterm WG2600HS2",
              "vendor": "NEC Platforms, Ltd.",
              "versions": [
                {
                  "status": "affected",
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              "defaultStatus": "unknown",
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              "defaultStatus": "unknown",
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              "vendor": "NEC Platforms, Ltd.",
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                {
                  "status": "affected",
                  "version": "Before Ver. 1.4.2"
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              "defaultStatus": "unknown",
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              "type": "reporter",
              "user": "00000000-0000-4000-9000-000000000000",
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                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "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",
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                "vulnConfidentialityImpact": "LOW",
                "vulnIntegrityImpact": "LOW",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
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              ]
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          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-912",
                  "description": "CWE-912: Hidden Functionality",
                  "lang": "en",
                  "type": "CWE"
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          "providerMetadata": {
            "dateUpdated": "2026-04-10T04:13:59.147Z",
            "orgId": "f2760a35-e0d8-4637-ac4c-cc1a2de3e282",
            "shortName": "NEC"
          },
          "references": [
            {
              "url": "https://jpn.nec.com/security-info/secinfo/nv26-001_en.html"
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          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "x_generator": {
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        }
      },
      "cveMetadata": {
        "assignerOrgId": "f2760a35-e0d8-4637-ac4c-cc1a2de3e282",
        "assignerShortName": "NEC",
        "cveId": "CVE-2026-4621",
        "datePublished": "2026-03-27T11:52:48.222Z",
        "dateReserved": "2026-03-23T06:04:48.670Z",
        "dateUpdated": "2026-04-10T04:13:59.147Z",
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      "dataType": "CVE_RECORD",
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    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.