Authenticated OS command execution via unsanitized CGI parameters
Published Mar 16, 2026 · Updated Mar 16, 2026
Command injection in D-Link NAS and NVR firmware through 20260205 allows remote authenticated users to execute arbitrary OS commands. The system_mgr.cgi binary passes attacker-controlled hostname, command1, or command2 parameters from cgi_device and cgi_sms_test into OS commands without neutralization. A valid management session is shown in the public requests, and successful exploitation starts an attacker-selected shell service on the appliance.
Summary
What happened
Command injection in D-Link NAS and NVR firmware through 20260205 allows remote authenticated users to execute arbitrary OS commands. The system_mgr.cgi binary passes attacker-controlled hostname, command1, or command2 parameters from cgi_device and cgi_sms_test into OS commands without neutralization. A valid management session is shown in the public requests, and successful exploitation starts an attacker-selected shell service on the appliance.
The record
- CVE
- CVE-2026-4207
- Published
- Mar 16, 2026
- Updated
- Mar 16, 2026
- Vendor
- D-Link
- Product
- DNR-322L
- Classifications
- CWE-74, CWE-77, T1059
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Mar 16, 2026CVE publishedPublication date reported by the CVE source.
- Mar 16, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=20260205
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
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
- DNS-320 cgi_device hostname command-injection PoCfunctional · demonstrated
- DNS-320 cgi_sms_test command-injection PoCfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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