CVE-2026-2873— Tenda A21 openSchedWifi setSchedWifi stack-based overflow
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I. Basic Information for CVE-2026-2873
Vulnerability Information
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Vulnerability Title
Tenda A21 openSchedWifi setSchedWifi stack-based overflow
Source: NVD (National Vulnerability Database)
Vulnerability Description
A vulnerability was detected in Tenda A21 1.0.0.0. This issue affects the function setSchedWifi of the file /goform/openSchedWifi. Performing a manipulation of the argument schedStartTime/schedEndTime results in stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit is now 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
栈缓冲区溢出
Source: NVD (National Vulnerability Database)
Vulnerability Title
Tenda A21 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda A21是中国腾达（Tenda）公司的一个无线信号扩展器。 Tenda A21 1.0.0.0版本存在安全漏洞，该漏洞源于/goform/openSchedWifi文件中setSchedWifi函数对参数schedStartTime/schedEndTime的操作存在栈缓冲区溢出。
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-2026-2873
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Same Patch Batch · Tenda · 2026-02-21 · 8 CVEs total
| CVE-2026-2886 | 8.8 HIGH | Tenda A21 SetOnlineDevName set_device_name stack-based overflow |
| CVE-2026-2877 | 8.8 HIGH | Tenda A18 Httpd Service WifiExtraSet strcpy stack-based overflow |
| CVE-2026-2876 | 8.8 HIGH | Tenda A18 setBlackRule parse_macfilter_rule stack-based overflow |
| CVE-2026-2874 | 8.8 HIGH | Tenda A21 fast_setting_wifi_set form_fast_setting_wifi_set stack-based overflow |
| CVE-2026-2872 | 8.8 HIGH | Tenda A21 MAC Filtering Configuration Endpoint setBlackRule set_device_name stack-based ov |
| CVE-2026-2871 | 8.8 HIGH | Tenda A21 SetIpMacBind fromSetIpMacBind stack-based overflow |
| CVE-2026-2870 | 8.8 HIGH | Tenda A21 formSetQosBand set_qosMib_list stack-based overflow |
IV. Related Vulnerabilities
Same product: A21
- CVE-2026-2886
Tenda A21 SetOnlineDevName set_device_name stack-based overf - CVE-2026-2874
Tenda A21 fast_setting_wifi_set form_fast_setting_wifi_set s - CVE-2026-2872
Tenda A21 MAC Filtering Configuration Endpoint setBlackRule - CVE-2026-2871
Tenda A21 SetIpMacBind fromSetIpMacBind stack-based overflow - CVE-2026-2870
Tenda A21 formSetQosBand set_qosMib_list stack-based overflo
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-121
- CVE-2026-8258
Squirrel sqstdstring.cpp validate_format stack-based overflo - CVE-2026-8234
EFM ipTIME A8004T WifiBasicSet formWifiBasicSet stack-based - CVE-2026-6665
PgBouncer buffer overflow in SCRAM - CVE-2026-41509
Integer underflow in crypto_sign_open() leads to buffer over - CVE-2026-8138
Tenda CX12L SetPptpServerCfg” formSetPPTPServer stack-based
V. Comments for CVE-2026-2873
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