Unauthenticated code execution via loopback request proxy
Published Apr 26, 2022 · Updated Aug 6, 2026
Command injection in Mitel MiVoice Connect Service Appliances through 19.2 SP3 allows remote attackers to execute code over HTTP. The vtest.php get_url parameter makes a loopback request to ucbsync.php, whose syncfile handler passes an unvalidated parameter into a curl command that pipes attacker content to sh. External requests cannot reach ucbsync.php directly, but the loopback proxy bypasses that restriction and enables an unauthenticated reverse shell in the appliance context.
Summary
What happened
Command injection in Mitel MiVoice Connect Service Appliances through 19.2 SP3 allows remote attackers to execute code over HTTP. The vtest.php get_url parameter makes a loopback request to ucbsync.php, whose syncfile handler passes an unvalidated parameter into a curl command that pipes attacker content to sh. External requests cannot reach ucbsync.php directly, but the loopback proxy bypasses that restriction and enables an unauthenticated reverse shell in the appliance context.
The record
- CVE
- CVE-2022-29499
- Published
- Apr 26, 2022
- Updated
- Aug 6, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-20, T1059.004, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 1, 2022Exploitation reportedObserved zero-day exploitation for initial access
- Apr 26, 2022CVE publishedPublication date reported by the CVE source.
- Aug 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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.
Weakness, pattern, technique
Public exploit references
- CrowdStrike two-request loopback exploit sequencefunctional · observed in use
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Reported exploitation
- Observed zero-day exploitation for initial accessreported exploitation
- CISA Known Exploited Vulnerabilities listingknown exploited catalog
Technologies
Your stack
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Your stack
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