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VulnerabilityPublished

CVE-2026-35090: Slican CCT-1668 · Authentication Bypass Using an Alternate Path or Channel

Affects Slican CCT-1668Source CVE Database V5

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Not known to be exploited · CVSS 9.3 Critical : upgrade to 6.56.0430 as a priority.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 4.0 base score
9.3Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.6% chance of exploitation in 30 days – higher than 49% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 6.56.0430, 6.30.0510, 6.61.0040
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

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 27 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade CCT-1668 and MAC-6400 to 6.56.0430; CXS-0424 to 6.30.0510; IPL-256 and IPM-032 to 6.61.0040.

Affected software

ProductAffectedFixed in
SlicanCCT-1668Affected
  • <6.56.0430
Fixed in
  • 6.56.0430
SlicanMAC-6400Affected
  • <6.56.0430
Fixed in
  • 6.56.0430
SlicanCXS-0424Affected
  • <6.30.0510
Fixed in
  • 6.30.0510
SlicanIPL-256Affected
  • <6.61.0040
Fixed in
  • 6.61.0040
SlicanIPM-032Affected
  • <6.61.0040
Fixed in
  • 6.61.0040

AI-suggested

Fixed versions are available for supported products: IPL-256 and IPM-032 version 6.61.0040 or later, CCT-1668 and MAC-6400 version 6.56.0430 or later, and CXS-0424 version 6.30.0510 or later. Users should upgrade to these versions to remediate the vulnerability. For End-Of-Life devices (CCT-1668, MAC-6400, CXS-0424 versions 4.xx and below), no software patches are available. The vendor recommends contacting their service department to explore hardware upgrade options. Patch status is not explicitly stated in the advisory for all products, but fixed versions are identified. No known exploits are reported in the wild.

Description

In Slican telephone exchanges it is possible to manage the control panel remotely. An unauthenticated attacker can connect to the modem via a telephone with a specific caller ID. This allows them to bypass admin authentication and gain full access to the service protocol and configuration panel. This vulnerability is independent of the telephone exchanges configuration. If remote access is disabled, calling with this caller ID will temporarily enable it. This issue was fixed in versions below: - IPL-256: version 6.61.0040 - IPM-032: 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.

References

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