CVE-2025-8939— Tenda AC20 WifiGuestSet buffer overflow
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I. Basic Information for CVE-2025-8939
Vulnerability Information
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Vulnerability Title
Tenda AC20 WifiGuestSet buffer overflow
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability was determined in Tenda AC20 up to 16.03.08.12. Affected is an unknown function of the file /goform/WifiGuestSet. The manipulation of the argument shareSpeed leads to buffer overflow. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Tenda AC20 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda AC20是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC20 16.03.08.12及之前版本存在安全漏洞，该漏洞源于文件/goform/WifiGuestSet中参数shareSpeed的错误操作导致缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2025-8939
| # | POC Description | Source Link | Shenlong Link |
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Same Patch Batch · Tenda · 2025-08-14 · 5 CVEs total
| CVE-2025-8958 | 8.8 HIGH | Tenda TX3 fast_setting_wifi_set stack-based overflow |
| CVE-2025-8940 | 8.8 HIGH | Tenda AC20 saveParentControlInfo strcpy buffer overflow |
| CVE-2025-8980 | 6.6 MEDIUM | Tenda G1 Firmware Update check_upload_file data authenticity |
| CVE-2025-8979 | 6.6 MEDIUM | Tenda AC15 Firmware Update check_fw data authenticity |
IV. Related Vulnerabilities
Same product: AC20
- CVE-2025-15356
Tenda AC20 PowerSaveSet sscanf buffer overflow - CVE-2025-14656
Tenda AC20 openSchedWifi httpd buffer overflow - CVE-2025-14655
Tenda AC20 httpd SetSysAutoRebbotCfg formSetRebootTimer stac - CVE-2025-14654
Tenda AC20 httpd setPptpUserList formSetPPTPUserList stack-b - CVE-2025-13258
Tenda AC20 WifiExtraSet buffer overflow
Same vendor: Tenda
- CVE-2026-8265
Tenda AC6 httpd getLogFile get_log_file os command injection - CVE-2026-8264
Tenda AC6 httpd WifiApScan formWifiApScan os command injecti - CVE-2026-8263
Tenda AC6 httpd WifiExtraSet fromSetWirelessRepeat os comman - CVE-2026-8259
Tenda AC6 httpd telnet os command injection - CVE-2026-8138
Tenda CX12L SetPptpServerCfg” formSetPPTPServer stack-based
Same weakness: CWE-120
- CVE-2026-8260
D-Link DCS-935L HNAP Service hnap_service SetDeviceSettings - CVE-2026-8137
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MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow - CVE-2026-7857
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V. Comments for CVE-2025-8939
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