Protected communications interception via unchecked TLS certificate errors
Published Aug 27, 2026 · Updated Aug 27, 2026
Improper certificate validation in Applied Systems Engineering ASE2000 2.35 through 2.37 allows remote attackers to intercept IEC 104 TLS traffic. The IEC 60870-5-104 TLS client certificate validation logic accepts certificate error conditions instead of rejecting the peer. Man-in-the-middle attackers must gain a network position between the TLS client and intended peer; resulting access is limited to reading or modifying that session's communications.
Summary
What happened
Improper certificate validation in Applied Systems Engineering ASE2000 2.35 through 2.37 allows remote attackers to intercept IEC 104 TLS traffic. The IEC 60870-5-104 TLS client certificate validation logic accepts certificate error conditions instead of rejecting the peer. Man-in-the-middle attackers must gain a network position between the TLS client and intended peer; resulting access is limited to reading or modifying that session's communications.
The record
- CVE
- CVE-2026-18717
- Published
- Aug 27, 2026
- Updated
- Aug 27, 2026
- Vendor
- Applied Systems Engineering
- Product
- ASE2000 V2 RTU Test Set
- Classifications
- CWE-295, T0830
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 27, 2026CVE publishedPublication date reported by the CVE source.
- Aug 27, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.25 <=2.37
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo