CVE-2026-90647

High

Description

ASE/Kalkitech ASE2000 V2 Communication Test Set 2.35 through 2.37 on Windows contains an improper certificate validation vulnerability in the IEC 60870-5-104 TLS client (Task Mode). This allows a network-positioned attacker to bypass certificate validation via a certificate with multiple simultaneous faults, enabling a Man-in-the-Middle attack on protected communications.

SeverityHigh

CVSS7.4

Exploit probability—

ProductASE2000 V2 Communication Test Set

PublishedSep 12, 2026

First seenSep 12, 2026

Weakness typeCWE-295CWE-295

How to fix

Update

Kalkitech ASE2000 V2 Communication Test Set2.38 or later

Vendor advisories

ase-systems.com/wp-content/uploads/2026/07/CYB_2026_86278_Advisory_v1.0.pdf

Affected products

Product	Affected versions	Fixed in
Kalkitech ASE2000 V2 Communication Test Set	2.35 ≤ v < 2.38	2.38

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