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CVE-2026-5021— Tenda F453 httpd PPTPUserSetting fromPPTPUserSetting stack-based overflow

Quick assessment

Affected
Tenda F453
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 F453是中国腾达（Tenda）公司的一款无线路由器。 Tenda F453 1.0.0.3版本存在安全漏洞，该漏洞源于组件httpd中文件/goform/PPTPUserSetting的函数fromPPTPUserSetting对参数delno操作不当，可能导致栈缓冲区溢出。

CVSS 8.8 · High EPSS 1.01% · P62

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-5021

Vulnerability Information
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Vulnerability Title
Tenda F453 httpd PPTPUserSetting fromPPTPUserSetting stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been found in Tenda F453 1.0.0.3. This affects the function fromPPTPUserSetting of the file /goform/PPTPUserSetting of the component httpd. This manipulation of the argument delno causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been published and may be used.
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 F453 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda F453是中国腾达（Tenda）公司的一款无线路由器。 Tenda F453 1.0.0.3版本存在安全漏洞，该漏洞源于组件httpd中文件/goform/PPTPUserSetting的函数fromPPTPUserSetting对参数delno操作不当，可能导致栈缓冲区溢出。
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

Vendor Product Affected Versions CPE Subscribe
Tenda F453 1.0.0.3 cpe:2.3:o:tenda:f453_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-5021

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6919 chars
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III. Intelligence Information for CVE-2026-5021

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Vendor Advisories for CVE-2026-5021 (2)

Other References for CVE-2026-5021 (1)

Same Patch Batch · Tenda · 2026-03-29 · 4 CVEs total

CVE-2026-5046 8.8 HIGH Tenda FH1201 Parameter WrlExtraSet formWrlExtraSet stack-based overflow
CVE-2026-5045 8.8 HIGH Tenda FH1201 Parameter WrlclientSet stack-based overflow
CVE-2026-5036 8.8 HIGH Tenda 4G06 Endpoint DhcpListClient fromDhcpListClient stack-based overflow

IV. Related Vulnerabilities

Same product: F453
Same vendor: Tenda
Same weakness: CWE-121

V. Comments for CVE-2026-5021

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