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.
CVE-2026-75501
UNRATEDCVSS · not yet scoredTrending — 4 sources updated this week
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EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- No CVSS published and no exploitation signals yet
CISA-KEV: Not listedEPSS PROB: —CVSS v2: —Exploit: None knownExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
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- EchelonGraph score
- Not yet assessedNo source has published severity data for this CVE yet — no CVSS score from NVD or a CNA, no GitHub advisory, and it is not in CISA KEV. This is not a rating of zero; we cannot assess it yet.
- EG Score
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- EG Risk
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- EPSS PROB
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- EPSS %ILE
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- KEV
- Not listed
Published
August 21, 2026
Last Modified
August 21, 2026
References (3)
- cret@certhttps://drkq.github.io/security-research/calix-vu756733/
- cret@certhttps://kb.cert.org/vuls/id/756733
- af854a3a-2127-422b-91ae-364da2661108https://www.kb.cert.org/vuls/id/756733
Vendor Advisories for CVE-2026-75501(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Data Freshness Timeline
(refreshed 6× in last 7d / 6× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-08-21 16:20 UTCNVD update
- 2026-08-21 16:20 UTCGHSA enrichment
- 2026-08-21 16:19 UTCMITRE cvelistV5
- 2026-08-21 15:20 UTCNVD update
- 2026-08-21 14:54 UTCEG score recompute
- 2026-08-21 14:54 UTCMITRE cvelistV5first tracked
Frequently asked(3)
What is CVE-2026-75501?
CVE-2026-75501 is a publicly disclosed vulnerability published on August 21, 2026. 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…
When was CVE-2026-75501 disclosed?
CVE-2026-75501 was first published in the National Vulnerability Database on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
How do I remediate CVE-2026-75501?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-75501, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-75501
Is Your Infrastructure Affected by CVE-2026-75501?
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