CVE-2026-75501

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-75501
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-21 15:16:47 UTC
Updated2026-09-08 14:07:06 UTC
DescriptionA 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 And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.003680000 probability, percentile 0.295140000 (date 2026-08-25)

Problem Types: CWE-306 | CWE-306 Missing Authentication for Critical Function | CWE-306 CWE-306 Missing Authentication for Critical Function

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Calix GS7 XGS GS5239XG affected Firmware EXOS/6.6.47 custom Not specified

References

ReferenceSourceLinkTags
kb.cert.org/vuls/id/756733 [email protected] kb.cert.org
www.kb.cert.org/vuls/id/756733 af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org
drkq.github.io/security-research/calix-vu756733 134c704f-9b21-4f2e-91b3-4a467353bcc0 drkq.github.io
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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