# CVE-2026-90647

## Summary

- **CVE ID:** CVE-2026-90647
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-295
- **Published:** Sep 12, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

- Kalkitech — ASE2000 V2 Communication Test Set (2.35)

## References

- [CNA](https://www.ase-systems.com/wp-content/uploads/2026/07/CYB_2026_86278_Advisory_v1.0.pdf)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 3.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-19._