Vulnerability Description
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.
References
- https://drkq.github.io/security-research/calix-vu756733/
- https://kb.cert.org/vuls/id/756733
- https://www.kb.cert.org/vuls/id/756733
FAQ
What is CVE-2026-75501?
CVE-2026-75501 is a documented vulnerability. 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 servic...
How severe is CVE-2026-75501?
CVSS scoring is not yet available for CVE-2026-75501. Check NVD for updates.
Is there a patch for CVE-2026-75501?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.