CVE-2026-75501Public exploitNetwork attack vector

Unauthenticated NAT bypass via WAN-exposed UPnP control

Published Aug 21, 2026 · Updated Aug 21, 2026

Missing authentication in Calix GigaSpire 7u10txg EXOS 6.6.47 and earlier allows remote attackers to modify NAT mappings via SOAP requests. MiniUPnPd 2.3.7 binds the /ctl/IPConn WANIPConnection control endpoint to the public WAN interface on TCP port 5000 and accepts mapping and query actions without authenticating requests. The default UPnP-enabled configuration exposes the endpoint; arbitrary forwarding rules bypass the NAT and firewall boundary and publish internal LAN services to the internet.

CVSS severity7.5
High
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authentication in Calix GigaSpire 7u10txg EXOS 6.6.47 and earlier allows remote attackers to modify NAT mappings via SOAP requests. MiniUPnPd 2.3.7 binds the /ctl/IPConn WANIPConnection control endpoint to the public WAN interface on TCP port 5000 and accepts mapping and query actions without authenticating requests. The default UPnP-enabled configuration exposes the endpoint; arbitrary forwarding rules bypass the NAT and firewall boundary and publish internal LAN services to the internet.

The record

CVE
CVE-2026-75501
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
Calix
Product
GigaSpire 7u10txg
Classifications
CWE-306, T1562.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=Firmware EXOS/6.6.47

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Calix · GigaSpire 7u10txgversion=0 <=Firmware EXOS/6.6.47

Published CVSS scores

9.1Brian Khan QuintanaCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1562.004Impair Defenses: Disable or Modify System Firewall

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo