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CVE-2026-35088: Inadequate Encryption Strength in Slican telephone exchanges

• Severity: high (CVSS 8.2 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-15 · updated 2026-10-16
• Weakness: CWE-326

Description

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.

Affected products

• Slican CCT-1668: through 6.56.0430
• Slican CXS-0424: through 6.30.0510
• Slican IPx: before 6.62.0100 — fixed in 6.62.0100
• Slican MAC-6400: through 6.56.0430

How to fix

Upgrade to a fixed version: Slican IPx 6.62.0100. Check the vendor advisory for mitigations.

References

• https://cert.pl/posts/2026/10/CVE-2026-35088

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