# CVE-2026-90647 — Kalkitech ASE2000 V2 Communication Test Set

> As of 2026-09-12, CVE-2026-90647 is a HIGH-severity vulnerability in Kalkitech ASE2000 V2 Communication Test Set, CVSS v3.1 7.4. No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-90647 as of 2026-09-12; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-12

## What is CVE-2026-90647?

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.

The record classifies CVE-2026-90647 under weakness class [CWE-295](https://intel.threadlinqs.com/cwe/CWE-295). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 23 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.4 — HIGH (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **CVSS v4.0 base 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`)
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 3.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-12

## Is CVE-2026-90647 being exploited?

It currently carries a trending score of 30 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **Kalkitech**: ASE2000 V2 Communication Test Set

## How to fix CVE-2026-90647

No vendor patch reference has been recorded for CVE-2026-90647 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-90647

No threat campaign in the Threadlinqs corpus currently references CVE-2026-90647, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD. Last verified by Threadlinqs on 2026-09-14. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

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

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-90647
Full detection coverage and IOCs for threats exploiting CVE-2026-90647 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp