Authenticated command execution via WAN input injection
Published Aug 19, 2026 · Updated Aug 20, 2026
OS command injection in TP-Link Archer C20 v6 firmware allows remote authenticated users to execute arbitrary system commands via WAN configuration requests. TP-Link attributes the flaw to insufficient input validation in the web management interface while processing certain WAN-related configuration operations, but has not disclosed the exact handler or parameter that passes attacker-controlled input into an OS command. Reachability is limited to authenticated administrator access on the adjacent management plane, and successful exploitation can fully compromise the router and traffic traversing it.
Summary
What happened
OS command injection in TP-Link Archer C20 v6 firmware allows remote authenticated users to execute arbitrary system commands via WAN configuration requests. TP-Link attributes the flaw to insufficient input validation in the web management interface while processing certain WAN-related configuration operations, but has not disclosed the exact handler or parameter that passes attacker-controlled input into an OS command. Reachability is limited to authenticated administrator access on the adjacent management plane, and successful exploitation can fully compromise the router and traffic traversing it.
The record
- CVE
- CVE-2026-75616
- Published
- Aug 19, 2026
- Updated
- Aug 20, 2026
- Vendor
- TP-Link Systems Inc.
- Product
- Archer C20
- Classifications
- CWE-78, CAPEC-88, T1059.004
- Attack vector
- adjacent
- Privileges
- admin
Timeline
How it unfolded
- Aug 19, 2026CVE publishedPublication date reported by the CVE source.
- Aug 20, 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 <EU_0.9.1 Build 260811
- Affected versionversion=0 <RU_0.9.1 Build 260812
- Affected versionversion=0 <US_0.9.1 Build 260812
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
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Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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