Slican IPx/CCT-1668/MAC-6400/CXS-0424/NCP authentication bypass

Summaryinfo

A vulnerability, which was classified as critical, has been found in Slican IPx, CCT-1668, MAC-6400, CXS-0424 and NCP. This vulnerability affects unknown code. Performing a manipulation results in authentication bypass. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is identified as CVE-2026-35087. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Slican IPx, CCT-1668, MAC-6400, CXS-0424 and NCP. It has been classified as very critical. This affects an unknown functionality. The manipulation with an unknown input leads to a authentication bypass vulnerability. CWE is classifying the issue as CWE-288. A product requires authentication, but the product has an alternate path or channel that does not require authentication. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Slican telephone exchanges allow administrative protocol authentication bypass. An attacker can bypass the need to enter login credentials by executing the appropriate command. This issue was fixed in versions below: - NCP: version 1.24.0250 - IPx series: 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.

The weakness was released by Grupa Żn. It is possible to read the advisory at cert.pl. This vulnerability is uniquely identified as CVE-2026-35087 since 04/01/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/27/2026).

Upgrading eliminates this vulnerability.

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Productinfo

Vendor

• Slican

Name

• CCT-1668
• CXS-0424
• IPx
• MAC-6400
• NCP

Support

• end of life

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