PT-2026-43699 · Slican · Cct-1668+4

Grupa Żn · Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-35087

Mitre

CVSS v4.0

9.3

Critical

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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.

Fix

Authentication Bypass Using an Alternate Path or Channel

Weakness Enumeration

CWE-288

Related Identifiers

CVE-2026-35087

Affected Products

Cct-1668

Cxs-0424

Ipx

Mac-6400

Ncp

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-35087 · Security Note
• https://twitter.com/f1tym1/status/2059616719404970170 · Twitter Post
• https://cert.pl/posts/2026/05/CVE-2026-35087 · Note