CVE-2026-90647

Improper Certificate Validation in ASE2000 V2 Communication Test Set Enables MITM

Published Sep 12, 2026 CVSS 4.0 · 9.1 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Improper Certificate Validation in ASE2000 V2 Communication Test Set Enables MITM
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Improper Certificate Validation in IEC 60870‑5‑104 TLS Client
Type Values Removed Values Added
Title Improper Certificate Validation in IEC 60870‑5‑104 TLS Client
Type Values Removed Values Added
Title Improper Certificate Validation in IEC 60870-5-104 TLS Client Enabling Man‑in‑the‑Middle Attack
Type Values Removed Values Added
Title Improper Certificate Validation in IEC 60870-5-104 TLS Client Enabling Man‑in‑the‑Middle Attack
Type Values Removed Values Added
First Time appeared Kalkitech
Kalkitech ase2000 V2 Communication Test Set
Vendors & Products Kalkitech
Kalkitech ase2000 V2 Communication Test Set
Type Values Removed Values Added
Title Improper Certificate Validation in IEC 60870‑5‑104 TLS Client Allows MITM
Type Values Removed Values Added
Title Improper Certificate Validation in IEC 60870‑5‑104 TLS Client Allows MITM
Type Values Removed Values Added
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.
Weaknesses CWE-295
References
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 9.1, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
mitre
Published
Updated
Sep 15, 2026, 5:10 PM
Reserved
Sep 12, 2026, 10:28 PM
Status
Deferred
Published
Sep 12, 2026, 11:17 PM
Modified
Sep 22, 2026, 8:00 PM