Authorization traffic interception via unchecked TLS certificates
Published Dec 9, 2025 · Updated Mar 10, 2026
Improper certificate validation in Siemens IAM Client allows remote attackers to intercept authorization-server TLS traffic. The shared IAM client establishes TLS connections to the authorization server without validating its server certificate, so an attacker-controlled endpoint is accepted as trusted. Exploitation requires a network position that permits interception, exposing authorization exchanges to disclosure and modification without interrupting service.
Summary
What happened
Improper certificate validation in Siemens IAM Client allows remote attackers to intercept authorization-server TLS traffic. The shared IAM client establishes TLS connections to the authorization server without validating its server certificate, so an attacker-controlled endpoint is accepted as trusted. Exploitation requires a network position that permits interception, exposing authorization exchanges to disclosure and modification without interrupting service.
The record
- CVE
- CVE-2025-40800
- Published
- Dec 9, 2025
- Updated
- Mar 10, 2026
- Vendor
- Siemens
- Product
- COMOS
- Classifications
- CWE-295, CAPEC-475, CAPEC-459, T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 9, 2025CVE publishedPublication date reported by the CVE source.
- Mar 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <V10.6.1
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
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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