Root command execution via unsanitized interface field
Published Mar 13, 2026 · Updated Mar 13, 2026
OS command injection in TP-Link TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6 allows remote authenticated users to execute commands as root. The port-trigger path inserts the configuration-controlled X_TP_IfName value into an iptables command and passes it to util_execSystem without neutralizing shell metacharacters. Exploitation requires adjacent-network access, administrative credentials, a crafted configuration import, and subsequent port-trigger processing; successful execution grants full control of the router.
Summary
What happened
OS command injection in TP-Link TL-WR802N v4, TL-WR841N v14, and TL-WR840N v6 allows remote authenticated users to execute commands as root. The port-trigger path inserts the configuration-controlled X_TP_IfName value into an iptables command and passes it to util_execSystem without neutralizing shell metacharacters. Exploitation requires adjacent-network access, administrative credentials, a crafted configuration import, and subsequent port-trigger processing; successful execution grants full control of the router.
The record
- CVE
- CVE-2026-3227
- Published
- Mar 13, 2026
- Updated
- Mar 13, 2026
- Vendor
- TP-Link Systems Inc.
- Product
- TL-WR840N
- Classifications
- CWE-78, T1059
- Attack vector
- adjacent
- Privileges
- admin
Timeline
How it unfolded
- Mar 13, 2026CVE publishedPublication date reported by the CVE source.
- Mar 13, 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=0 <V6_260304
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
- CVE-2026-3227-TP-Link-authenticated-RCEproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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