EUVD-2026-32278
GHSA-4fcp-hv44-rggc
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionNVD
In Slican telephone exchanges it is possible to manage the control panel remotely. An unauthenticated attacker can connect to the modem via a telephone with a specific caller ID. This allows them to bypass admin authentication and gain full access to the service protocol and configuration panel. This vulnerability is independent of the telephone exchanges configuration. If remote access is disabled, calling with this caller ID will temporarily enable it.
This issue was fixed in versions below:
- IPL-256: version 6.61.0040
- IPM-032: version 6.61.0040
- CCT-1668: version 6.56.0430
- MAC-6400: version 6.56.0430
- CXS-0424: version 6.30.0510
The issue STILL EXISTS in End-Of-Life telephone exchanges in versions 4.xx and below:
- CCT-1668 (CCT1CPU)
- MAC-6400
- CXS-0424
These products were discontinued in 2011 and 2012 and and will not receive updates. These products require a hardware update in order to receive a software update. The vendor recommends that users of these devices contact the their service department directly to determine the options for upgrading.
AnalysisAI
Authentication bypass in Slican telephone exchanges (IPL-256, IPM-032, CCT-1668, MAC-6400, CXS-0424) lets an unauthenticated remote attacker who dials the device's management modem while presenting a specific caller ID bypass admin authentication and obtain full access to the service protocol and configuration panel. Because this 'magic' caller ID works regardless of how the exchange is configured - and even temporarily re-enables remote management when an administrator has disabled it - the flaw behaves like a hidden backdoor rather than a normal misconfiguration. …
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RemediationAI
24 hours: Inventory all Slican exchanges in production (IPL-256, IPM-032, CCT-1668, MAC-6400, CXS-0424 firmware 4.xx and below); assess management modem connectivity; disable remote management access if operationally feasible. 7 days: Complete affected hardware inventory; implement network segmentation with firewall rules restricting management interface access to authorized locations only; initiate replacement planning for permanently unpatched EOL units (CCT-1668, MAC-6400, CXS-0424). …
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