Unauthenticated security bypass via CL.0 desynchronization
Published Jan 26, 2026 · Updated Jan 26, 2026
HTTP request smuggling in all versions of Altitude Communication Server allows remote attackers to obtain indirect disclosure via crafted requests. Its HTTP parser inconsistently handles Content-Length across multiple requests on one persistent Keep-Alive connection, desynchronizing frontend and backend request boundaries. No authentication or user interaction is required; the assessed consequence is indirect disclosure through request hiding or security-control bypass.
Summary
What happened
HTTP request smuggling in all versions of Altitude Communication Server allows remote attackers to obtain indirect disclosure via crafted requests. Its HTTP parser inconsistently handles Content-Length across multiple requests on one persistent Keep-Alive connection, desynchronizing frontend and backend request boundaries. No authentication or user interaction is required; the assessed consequence is indirect disclosure through request hiding or security-control bypass.
The record
- CVE
- CVE-2025-41082
- Published
- Jan 26, 2026
- Updated
- Jan 26, 2026
- Vendor
- Altitude Software
- Product
- Altitude Communication Server
- Classifications
- CWE-444, CAPEC-33, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 26, 2026CVE publishedPublication date reported by the CVE source.
- Jan 26, 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=all versions
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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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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