# CVE-2026-75501

## Summary

- **CVE ID:** CVE-2026-75501
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
- **CWE:** N/A
- **Published:** Aug 21, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

- Calix — GS7 XGS (GS5239XG) (0)

## References

- [CNA](https://kb.cert.org/vuls/id/756733)
- [CNA](https://drkq.github.io/security-research/calix-vu756733/)
- [CVE](https://www.kb.cert.org/vuls/id/756733)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.59%
- **EPSS Percentile:** 46.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._