CVE-2026-35089

Use of Weak Credentials in Slican telephone exchanges

HIGH

8.7

CVSS Score

Published: May 27, 2026 at 12:42 PM UTC

Updated: October 26, 2026 at 11:10 AM UTC

4 products affected across 1 vendorIPxCCT-1668MAC-6400

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Severity

HIGH8.7

Exploit prediction

EPSS 0.6%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

CCT-1668 · Slican

90%

v < 6.56.0430

Affected range stops below 6.56.0430, so it looks safe — our inference, not a vendor statement

CXS-0424 · Slican

90%

v < 6.30.0510

Affected range stops below 6.30.0510, so it looks safe — our inference, not a vendor statement

IPx · Slican

90%

v < 6.61.0040

Affected range stops below 6.61.0040, so it looks safe — our inference, not a vendor statement

MAC-6400 · Slican

90%

v < 6.56.0430

Affected range stops below 6.56.0430, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Third Party Advisory

Source: cverecord

https://cert.pl/posts/2026/05/CVE-2026-35087

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHCERT-PL

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-1391

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