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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Slican IPx unaffected
Version Status Constraints
0 affected < 6.61.0040
Slican CCT-1668 unaffected
Version Status Constraints
0 affected < 6.56.0430
Slican MAC-6400 unaffected
Version Status Constraints
0 affected < 6.56.0430
Slican CXS-0424 unaffected
Version Status Constraints
0 affected < 6.30.0510
Slican NCP unaffected
Version Status Constraints
0 affected < 1.24.0250

No data.

No data.

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No data.

Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://cert.pl/posts/2026/05/CVE-2026-35087 cve-icon cve-icon
History

Wed, 27 May 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Wed, 27 May 2026 14:15:00 +0000

Type Values Removed Values Added
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.
Title Authentication Bypass in Slican telephone exchanges
Weaknesses CWE-288
References
Metrics cvssV4_0

{'score': 9.3, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: CERT-PL

Published:

Updated: 2026-05-27T15:39:44.033Z

Reserved: 2026-04-01T11:23:16.117Z

Link: CVE-2026-35087

cve-icon Vulnrichment

Updated: 2026-05-27T15:39:35.293Z

cve-icon NVD

Status : Received

Published: 2026-05-27T14:16:44.710

Modified: 2026-05-27T14:16:44.710

Link: CVE-2026-35087

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-27T16:30:36Z

Weaknesses