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Vulnerability record · CVE-2026-31255 · published 27 April 2026

CVE-2026-31255: Tenda ac18 firmware command injection vulnerability

Tenda · Ac18 Firmware

A command injection vulnerability exists in Tenda AC18 V15.03.05.05_multi. The vulnerability is located in the /goform/SetSambaCfg interface, where improper handling of the guestuser parameter allows attackers to execute arbitrary system commands.

9.8 CVSS 3.1 Critical EPSS 1.5% · top 27.0% CWE-77 · Command injection
9.8CVSS 3.1 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A command injection vulnerability exists in Tenda AC18 V15.03.05.05_multi. The vulnerability is located in the /goform/SetSambaCfg interface, where improper handling of the guestuser parameter allows attackers to execute arbitrary system commands.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/izxnfirh8148/CVE_REQUESTS_references/blob/main/Tenda_AC18/Tenda_AC18_3th/README.md ExploitThird Party Advisory
https://github.com/izxnfirh8148/CVE_REQUESTS_references/blob/main/Tenda_AC18/Tenda_AC18_3th/README.md ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-57579Tenda ac18 firmware out-of-bounds write vulnerabilityTenda AC18 V15.03.05.19 was discovered to contain a stack overflow via the limitSpeedUp parameter in the formSetClientState function.EPSS 0.68%9.8CVE-2024-57580Tenda ac18 firmware out-of-bounds write vulnerabilityTenda AC18 V15.03.05.19 was discovered to contain a stack overflow via the devName parameter in the formSetDeviceName function.EPSS 0.77%9.8CVE-2024-57581Tenda ac18 firmware out-of-bounds write vulnerabilityTenda AC18 V15.03.05.19 was discovered to contain a stack overflow via the firewallEn parameter in the formSetFirewallCfg function.EPSS 0.75%9.8CVE-2024-57582Tenda ac18 firmware out-of-bounds write vulnerabilityTenda AC18 V15.03.05.19 was discovered to contain a stack overflow via the startIP parameter in the formSetPPTPServer function.EPSS 0.75%9.8CVE-2024-57583Tenda ac18 firmware command injection vulnerabilityTenda AC18 V15.03.05.19 was discovered to contain a command injection vulnerability via the usbName parameter in the formSetSambaConf function.EPSS 1.5%9.8CVE-2024-57575Tenda ac18 firmware out-of-bounds write vulnerabilityTenda AC18 V15.03.05.19 was discovered to contain a stack overflow via the ssid parameter in the form_fast_setting_wifi_set function.EPSS 0.79%9.8CVE-2024-33835Tenda ac18 firmware out-of-bounds write vulnerabilityTenda AC18 V15.03.05.05 has a stack overflow vulnerability in the remoteIp parameter from formSetSafeWanWebMan function.EPSS 0.82%9.8CVE-2024-28545Tenda ac18 firmware command injection vulnerabilityTenda AC18 V15.03.05.05 contains a command injection vulnerablility in the deviceName parameter of formsetUsbUnload function.EPSS 2.3%

Source: NIST National Vulnerability Database (record CVE-2026-31255), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.