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CVE-2026-75501

Quick assessment

Affected
Calix GS7 XGS (GS5239XG)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Calix EXOS 固件（应用于 GS7 XGS（GS5239XG）家用路由器）中存在一个漏洞，允许未经身份验证的远程攻击者通过 UPnP WANIPConnection 服务修改 NAT 端口转发规则。该设备在广域网（WAN）接口上暴露了 MiniUPnPd 控制端点，使用 TCP 端口 5000，且未施加任何访问控制。远程攻击者可以发送构造的 SOAP 请求，无需任何身份验证即可添加、删除或枚举端口映射，或查询外部 IP 地址。成功利用该漏洞可能导致绕过防火墙/NAT 边界，使内部局域网（LAN）服务暴露在公

AI Predicted 9.8 Difficulty: Trivial EPSS 0.37% · P30

Affected Version Matrix 1

VendorProduct Version RangeStatus
Calix GS7 XGS (GS5239XG) ≤ Firmware EXOS/6.6.47 affected
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I. Basic Information for CVE-2026-75501

Vulnerability Information
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Vulnerability Title
CVE-2026-75501
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Calix GS7 XGS (GS5239XG) 0 ~ Firmware EXOS/6.6.47 -

II. Public POCs for CVE-2026-75501

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III. Intelligence Information for CVE-2026-75501

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Vendor Advisories for CVE-2026-75501 (1)

Security Blog Posts for CVE-2026-75501 (1)

IV. Related Vulnerabilities

Same vendor: Calix

V. Comments for CVE-2026-75501

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