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CVE-2026-19821— Tenda AC12 httpd web management interface SetSysAutoRebbotCfg formSetRebootTimer buffer overflow

Quick assessment

Affected
Tenda AC12
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tenda ac12是中国Tenda公司的一款千兆双频无线路由器。 Tenda ac12 15.03.06.23_multi_TD01版本存在缓冲区错误漏洞，该漏洞源于httpd web管理接口的/goform/SetSysAutoRebbotCfg文件中formSetRebootTimer函数的rebootTime参数存在缓冲区溢出，攻击者可远程发起攻击。

CVSS 8.8 · High EPSS 0.85% · P57

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Tenda AC12 15.03.06.23_multi_TD01 affected
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I. Basic Information for CVE-2026-19821

Vulnerability Information
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Vulnerability Title
Tenda AC12 httpd web management interface SetSysAutoRebbotCfg formSetRebootTimer buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was determined in Tenda AC12 15.03.06.23_multi_TD01. This vulnerability affects the function formSetRebootTimer of the file /goform/SetSysAutoRebbotCfg of the component httpd web management interface. This manipulation of the argument rebootTime causes buffer overflow. The attack may be initiated remotely. The exploit has been publicly disclosed and may be utilized.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
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: CVE Program / CVE List V5
Vulnerability Title
Tenda ac12 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda ac12是中国Tenda公司的一款千兆双频无线路由器。 Tenda ac12 15.03.06.23_multi_TD01版本存在缓冲区错误漏洞，该漏洞源于httpd web管理接口的/goform/SetSysAutoRebbotCfg文件中formSetRebootTimer函数的rebootTime参数存在缓冲区溢出，攻击者可远程发起攻击。
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

Vendor Product Affected Versions CPE Subscribe
Tenda AC12 15.03.06.23_multi_TD01 cpe:2.3:h:tenda:ac12:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-19821

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9082 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-19821

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Proof of Concept for CVE-2026-19821 (1)

News Coverage for CVE-2026-19821 (1)

Other References for CVE-2026-19821 (2)

Same Patch Batch · Tenda · 2026-08-14 · 9 CVEs total

CVE-2026-19788 8.8 HIGH Tenda AC1206 httpd web management interface SetOnlineDevName set_device_name stack-based o
CVE-2026-19789 8.8 HIGH Tenda AC1206 httpd web management interface WifiGuestSet set_wl_guest_iplist stack-based o
CVE-2026-19790 8.8 HIGH Tenda G0 httpd Web Management module formSetPortMirror stack-based overflow
CVE-2026-19791 8.8 HIGH Tenda G0 httpd web management interface module addStaticRoute stack-based overflow
CVE-2026-19792 8.8 HIGH Tenda G0 httpd web management interface module setPortMapping buffer overflow
CVE-2026-19822 8.8 HIGH Tenda W20E QoS Edit editQos lstAdd stack-based overflow
CVE-2026-19823 8.8 HIGH Tenda W20E QoS Rule Deletion delQos formQOSRuleDel stack-based overflow
CVE-2026-19824 8.8 HIGH Tenda W20E addIpMacBind ipMacBindListStore stack-based overflow

IV. Related Vulnerabilities

Same vendor: Tenda
Same weakness: CWE-120

V. Comments for CVE-2026-19821

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