Man-in-the-middle attacks via missing server certificate validation
Published Dec 9, 2025 · Updated Dec 9, 2025
Improper certificate validation in Siemens engineering products allows remote attackers to intercept or alter SALT authorization traffic. The SALT SDK establishes TLS connections to the authorization server without validating its server certificate, so a forged endpoint is accepted. Exploitation requires a man-in-the-middle network position but no product authentication, and it can expose, modify, or disrupt authorization data.
Summary
What happened
Improper certificate validation in Siemens engineering products allows remote attackers to intercept or alter SALT authorization traffic. The SALT SDK establishes TLS connections to the authorization server without validating its server certificate, so a forged endpoint is accepted. Exploitation requires a man-in-the-middle network position but no product authentication, and it can expose, modify, or disrupt authorization data.
The record
- CVE
- CVE-2025-40801
- Published
- Dec 9, 2025
- Updated
- Dec 9, 2025
- Vendor
- Siemens
- Product
- COMOS
- Classifications
- CWE-295, T1557
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 9, 2025CVE publishedPublication date reported by the CVE source.
- Dec 9, 2025Record 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 <*
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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