Vulnerability-Lookup

GHSA-F7WJ-3V6P-GRPV

Vulnerability from github – Published: 2026-08-21 15:32 – Updated: 2026-08-21 18:34

Details

A vulnerability in the Calix EXOS firmware for the GS7 XGS (GS5239XG) residential router allows unauthenticated remote attackers to modify NAT port‑forwarding rules via the UPnP WANIPConnection service. The device exposes the MiniUPnPd control endpoint on the WAN interface on TCP port 5000 without access controls. A remote attacker can send crafted SOAP requests to add, delete, or enumerate port mappings, or to query the external IP address, without authentication. Successful exploitation may enable bypass of the firewall/NAT boundary and exposure of internal LAN services to the public internet.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-75501"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-21T15:16:47Z",
    "severity": null
  },
  "details": "A vulnerability in the Calix EXOS firmware for the GS7 XGS (GS5239XG) residential router allows unauthenticated remote attackers to modify NAT port\u2011forwarding rules via the UPnP WANIPConnection service. The device exposes the MiniUPnPd control endpoint on the WAN interface on TCP port 5000 without access controls. A remote attacker can send crafted SOAP requests to add, delete, or enumerate port mappings, or to query the external IP address, without authentication. Successful exploitation may enable bypass of the firewall/NAT boundary and exposure of internal LAN services to the public internet.",
  "id": "GHSA-f7wj-3v6p-grpv",
  "modified": "2026-08-21T18:34:56Z",
  "published": "2026-08-21T15:32:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75501"
    },
    {
      "type": "WEB",
      "url": "https://drkq.github.io/security-research/calix-vu756733"
    },
    {
      "type": "WEB",
      "url": "https://kb.cert.org/vuls/id/756733"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/756733"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-75501 (GCVE-0-2026-75501)

Vulnerability from cvelistv5 – Published: 2026-08-21 14:47 – Updated: 2026-08-21 16:08

Title

CVE-2026-75501

Summary

Severity

No CVSS data available.

CWE

CWE-306 Missing Authentication for Critical Function

Assigner

certcc mitre root

References

3 references

URL	Tags
https://kb.cert.org/vuls/id/756733
https://drkq.github.io/security-research/calix-vu…
https://www.kb.cert.org/vuls/id/756733

Impacted products

1 product

Vendor	Product	Version
Calix	GS7 XGS (GS5239XG)	Affected: 0 , ≤ Firmware EXOS/6.6.47 (custom)

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2026-08-21T16:08:02.872Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://www.kb.cert.org/vuls/id/756733"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "GS7 XGS (GS5239XG)",
          "vendor": "Calix",
          "versions": [
            {
              "lessThanOrEqual": "Firmware EXOS/6.6.47",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in the Calix EXOS firmware for the GS7 XGS (GS5239XG) residential router allows unauthenticated remote attackers to modify NAT port\u2011forwarding rules via the UPnP WANIPConnection service. The device exposes the MiniUPnPd control endpoint on the WAN interface on TCP port 5000 without access controls. A remote attacker can send crafted SOAP requests to add, delete, or enumerate port mappings, or to query the external IP address, without authentication. Successful exploitation may enable bypass of the firewall/NAT boundary and exposure of internal LAN services to the public internet."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-306 Missing Authentication for Critical Function",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-21T14:47:04.279Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "url": "https://kb.cert.org/vuls/id/756733"
        },
        {
          "url": "https://drkq.github.io/security-research/calix-vu756733/"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "CVE-2026-75501",
      "x_generator": {
        "engine": "VINCE 3.0.44",
        "env": "prod",
        "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-75501"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2026-75501",
    "datePublished": "2026-08-21T14:47:04.279Z",
    "dateReserved": "2026-08-17T20:36:51.717Z",
    "dateUpdated": "2026-08-21T16:08:02.872Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-F7WJ-3V6P-GRPV

CVE-2026-75501 (GCVE-0-2026-75501)

Tags

Sightings

Nomenclature