Authenticated command execution via injected ping address
Published Apr 9, 2021 · Updated Jul 9, 2026
OS command injection in WiFi-soft UniBox 2.4 appliances allows remote authenticated users to execute commands through /tools/ping. The /tools/ping handler accepts an address value containing shell metacharacters, and the published address=1;id payload executes id as the web-service account. A valid PHP session is required; the disclosed request demonstrates execution as www-data on U-50, Enterprise Series, and Campus Series devices.
Summary
What happened
OS command injection in WiFi-soft UniBox 2.4 appliances allows remote authenticated users to execute commands through /tools/ping. The /tools/ping handler accepts an address value containing shell metacharacters, and the published address=1;id payload executes id as the web-service account. A valid PHP session is required; the disclosed request demonstrates execution as www-data on U-50, Enterprise Series, and Campus Series devices.
The record
- CVE
- CVE-2020-21883
- Published
- Apr 9, 2021
- Updated
- Jul 9, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-78, T1059.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 9, 2021CVE publishedPublication date reported by the CVE source.
- Jul 9, 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
- Authenticated Remote Code Execution In Unibox 2.4 proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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