Tenda AC18
CVE-2026-38142
MEDIUM
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Unauthenticated network command injection on a router yields full C/I/A and scope change affecting downstream network traffic; AC:L confirmed by SSVC Automatable:yes.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Lifecycle Timeline
3DescriptionCVE.org
An unauthenticated command injection vulnerability in the /goform/fast_setting_internet_set endpoint of Tenda AC18 v15.03.05.05 allows attackers to execute arbitrary commands via a crafted payload injected into the mac parameter.
AnalysisAI
Unauthenticated OS command injection in Tenda AC18 v15.03.05.05 exposes the device to full remote compromise via a crafted HTTP request to the /goform/fast_setting_internet_set endpoint. The vulnerability is a second-order (stored) injection through the mac parameter - malicious payloads are written into device configuration and executed when triggered. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerability requires no authentication, no special configuration, and no user interaction - the /goform/fast_setting_internet_set endpoint is exposed by default on the LAN interface and may also be reachable via the WAN interface depending on whether remote management is enabled. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Despite the relatively modest NVD CVSS base score of 6.5 (C:L/I:L/A:N), the real-world risk is considerably higher and the reported score appears underweighted for a network-accessible unauthenticated command injection primitive. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated remote attacker sends a crafted HTTP POST request to http://[router-ip]/goform/fast_setting_internet_set with the mac parameter containing a shell metacharacter payload such as ; id > /tmp/pwned &. The router's CGI handler writes the unsanitized value into a persistent configuration store, and when that configuration is subsequently applied or read by a privileged background process, the injected command executes as root. … |
| Remediation | No vendor-released patch has been identified at time of analysis; Tenda has not published a security advisory for this CVE. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-77 – Command Injection
View allSame technique Command Injection
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External POC / Exploit Code
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