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    2 vulnerabilities found for GS7 XGS (GS5239XG) by Calix

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

    Vulnerability from nvd – Published: 2026-08-21 14:47 – Updated: 2026-08-25 19:26
    VLAI
    Title
    CVE-2026-75501
    Summary
    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.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-25 19:26 UTC
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    Calix GS7 XGS (GS5239XG) Affected: 0 , ≤ Firmware EXOS/6.6.47 (custom)
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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

    Vulnerability from cvelistv5 – Published: 2026-08-21 14:47 – Updated: 2026-08-25 19:26
    VLAI
    Title
    CVE-2026-75501
    Summary
    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.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-08-25 19:26 UTC
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    Calix GS7 XGS (GS5239XG) Affected: 0 , ≤ Firmware EXOS/6.6.47 (custom)
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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