TI-2026-61630 Aliases CVE-2026-90647 GHSA-gcc5-22r7-2jf2

Improper certificate validation in Kalkitech ASE2000 V2 Communication Test Set

MEDIUM 41CWE-295Published 2026-09-12 · Updated 2026-09-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Attack requirements: None
Impact type: Spoofing
Confidentiality · integrity · availability: High · High · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-295.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00214 11th percentileScored 2026-11-07

Fix Fixed ASE2000 V2 Communication Test Set (Kalkitech): 2.38

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Kalkitech	ASE2000 V2 Communication Test Set	2.35 to before 2.38	2.38	Patch available	CNA

ASE2000 V2 Communication Test Set VendorKalkitech Affected 2.35 to before 2.38 Fixed in 2.38 Patch available CNA

Remediation

Fix · CNA ASE2000 V2 Communication Test Set (Kalkitech) Fixed in 2.38

Timeline

2026-10-02 Threatist record created from CVE-2026-90647
2026-10-03 Alias added: GHSA-gcc5-22r7-2jf2

References

Advisory 1

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

TI-2019-08618 Kalki Kalkitech SYNC3000 Substation DCU GPC v2.22.6, 2.23.0, 2.24.0, 3.0.0, 3.1.0… CVSS 3.0CRITICAL 9.8
TI-2021-20150 A security vulnerability originally reported in the SYNC2101 product, and applicable to… CVSS 3.1HIGH 8.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences