Authenticated root command execution via newline injection
Published Feb 8, 2026 · Updated Feb 8, 2026
OS command injection in D-Link DIR-823X 250416 allows remote authenticated users to execute arbitrary commands through set_ac_status. The sub_41D274 handler accepts newline characters in ac_ipaddr, ac_ipstatus, or ap_randtime, writes the value into UCI configuration, and restarts capwap through a shell script that interprets the injected line as a command. Administrative credentials are required, and successful exploitation runs the injected command with root privileges on the router.
Summary
What happened
OS command injection in D-Link DIR-823X 250416 allows remote authenticated users to execute arbitrary commands through set_ac_status. The sub_41D274 handler accepts newline characters in ac_ipaddr, ac_ipstatus, or ap_randtime, writes the value into UCI configuration, and restarts capwap through a shell script that interprets the injected line as a command. Administrative credentials are required, and successful exploitation runs the injected command with root privileges on the router.
The record
- CVE
- CVE-2026-2129
- Published
- Feb 8, 2026
- Updated
- Feb 8, 2026
- Vendor
- D-Link
- Product
- DIR-823X
- Classifications
- CWE-78, CWE-77, T1059.004, T1190
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Feb 8, 2026CVE publishedPublication date reported by the CVE source.
- Feb 8, 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=250416
What conditions does exploitation require?
What is affected?
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
- set_ac_status newline-injection Python proof of conceptproof of concept · unverified
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Technologies
Your stack
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Your stack
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