---
id: CVE-2026-35088
title: "Slican telephone exchanges\_use symmetric encryption for TCP/IP communication"
summary: "Slican telephone exchanges\_use symmetric encryption for TCP/IP communication. Secret key is hardcoded in multiple\_binary files. An attacker who has access to these files can decrypt the communication.\n\nThis issue was fixed in\_IPx series …"
severity: high
cvss: 8.2
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N'
cwe:
  - CWE-326
vendor: Slican
product: IPx
affected:
  - IPx < 6.62.0100
  - CCT-1668 <= 6.56.0430
  - MAC-6400 <= 6.56.0430
  - CXS-0424 <= 6.30.0510
published: '2026-10-15'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T14:17:24.853'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-35088'
references:
  - url: 'https://cert.pl/posts/2026/10/CVE-2026-35088'
    label: cvd@cert.pl
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-15T13:47:59.175355Z'
cvssSource: cna
ingestedAt: '2026-10-15T09:59:33.278Z'
---

## Overview

Slican telephone exchanges use symmetric encryption for TCP/IP communication. Secret key is hardcoded in multiple binary files. An attacker who has access to these files can decrypt the communication.

This issue was fixed in IPx series version 6.62.0100.

The issue STILL EXISTS in End-Of-Life telephone exchanges:
- 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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.