CVE Catalog

CVE-2026-75501

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.59%

46th percentile - higher than 46% of all known CVEs

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.

Risk Assessment

Risk of bypassing network security and unauthorized access to internal services, potentially leading to data confidentiality and integrity breaches.

Recommendation

Immediately disable UPnP on the WAN interface or block TCP port 5000 on the network firewall, and check for firmware updates from the vendor.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS