CVE-2026-35087

Authentication Bypass in Slican telephone exchanges

State: Published
Severity: 9.3 Critical
Published: May 27, 2026
Updated: May 27, 2026
Reserved: Apr 1, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	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	CERT-PL

Weaknesses

CWE-288 Authentication Bypass Using an Alternate Path or Channel

Affected Products

Product	Versions
IPxSlican	before 6.61.0040Affected
CCT-1668Slican	before 6.56.0430Affected
MAC-6400Slican	before 6.56.0430Affected
CXS-0424Slican	before 6.30.0510Affected
NCPSlican	before 1.24.0250Affected

References

https://cert.pl/posts/2026/05/CVE-2026-35087third-party-advisory

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