PT-2026-43700 · Slican · Cct-1668+3

Grupa Żn · Published 2026-05-27 · Updated 2026-05-27 · CVE-2026-35089

Mitre

CVSS v4.0

8.7

High

Base vector

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

In Slican telephone exchanges secure key is generated in a predictable manner using properties of the telephone exchange which can be obtained without authentication. An unauthenticated attacker can deduce the secure key and obtain admin credentials.

This issue was fixed in versions below:

• 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

Weakness Enumeration

CWE-1391

Related Identifiers

CVE-2026-35089

Affected Products

Cct-1668

Cxs-0424

Ipx

Mac-6400

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-35089 · Security Note
• https://cert.pl/posts/2026/05/CVE-2026-35087 · Note
• https://twitter.com/f1tym1/status/2059616719404970170 · Twitter Post