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CVE-2026-19823— Tenda W20E QoS Rule Deletion delQos formQOSRuleDel stack-based overflow

Quick assessment

Affected
Tenda W20E
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 W20E是中国Tenda公司的一款企业级无线路由器。 Tenda W20E 15.11.0.6(1068_1546_841)_CN_TDC版本存在缓冲区错误漏洞，该漏洞源于QoS Rule Deletion组件中/goform/delQos文件的formQOSRuleDel函数对qosIndex参数操作不当，导致栈缓冲区溢出，远程攻击者可能利用该漏洞发起攻击。

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 W20E 15.11.0.6(1068_1546_841)_CN_TDC affected
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I. Basic Information for CVE-2026-19823

Vulnerability Information
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Vulnerability Title
Tenda W20E QoS Rule Deletion delQos formQOSRuleDel stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A security flaw has been discovered in Tenda W20E 15.11.0.6(1068_1546_841)_CN_TDC. Impacted is the function formQOSRuleDel of the file /goform/delQos of the component QoS Rule Deletion. Performing a manipulation of the argument qosIndex results in stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been released to the public and may be used for attacks.
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
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Tenda W20E 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda W20E是中国Tenda公司的一款企业级无线路由器。 Tenda W20E 15.11.0.6(1068_1546_841)_CN_TDC版本存在缓冲区错误漏洞，该漏洞源于QoS Rule Deletion组件中/goform/delQos文件的formQOSRuleDel函数对qosIndex参数操作不当，导致栈缓冲区溢出，远程攻击者可能利用该漏洞发起攻击。
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 W20E 15.11.0.6(1068_1546_841)_CN_TDC cpe:2.3:o:tenda:w20e_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-19823

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9264 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-2026-19823

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News Coverage for CVE-2026-19823 (2)

Other References for CVE-2026-19823 (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-2026-19821 8.8 HIGH Tenda AC12 httpd web management interface SetSysAutoRebbotCfg formSetRebootTimer buffer ov
CVE-2026-19822 8.8 HIGH Tenda W20E QoS Edit editQos lstAdd stack-based overflow
CVE-2026-19824 8.8 HIGH Tenda W20E addIpMacBind ipMacBindListStore stack-based overflow

IV. Related Vulnerabilities

Same product: W20E
Same vendor: Tenda
Same weakness: CWE-121

V. Comments for CVE-2026-19823

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