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CVE-2026-4903— Tenda AC5 POST Request QuickIndex formQuickIndex memory corruption

Quick assessment

Affected
Tenda AC5
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tenda AC5是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC5 15.03.06.47版本存在安全漏洞，该漏洞源于对组件POST Request Handler中文件/goform/QuickIndex的参数PPPOEPassword的错误操作，可能导致基于栈的缓冲区溢出。

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-2026-4903

Vulnerability Information
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Vulnerability Title
Tenda AC5 POST Request QuickIndex formQuickIndex memory corruption
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been found in Tenda AC5 15.03.06.47. This vulnerability affects the function formQuickIndex of the file /goform/QuickIndex of the component POST Request Handler. This manipulation of the argument PPPOEPassword causes stack-based buffer overflow. The attack may be initiated remotely. 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 AC5 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda AC5是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC5 15.03.06.47版本存在安全漏洞，该漏洞源于对组件POST Request Handler中文件/goform/QuickIndex的参数PPPOEPassword的错误操作，可能导致基于栈的缓冲区溢出。
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 AC5 15.03.06.47 cpe:2.3:o:tenda:ac5_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-4903

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III. Intelligence Information for CVE-2026-4903

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Vendor Advisories for CVE-2026-4903 (2)

Security Blog Posts for CVE-2026-4903 (1)

Same Patch Batch · Tenda · 2026-03-26 · 4 CVEs total

CVE-2026-4905 8.8 HIGH Tenda AC5 POST Request WifiWpsOOB formWifiWpsOOB stack-based overflow
CVE-2026-4904 8.8 HIGH Tenda AC5 POST Request setcfm formSetCfm stack-based overflow
CVE-2026-4902 8.8 HIGH Tenda AC5 POST Request addressNat fromAddressNat memory corruption

IV. Related Vulnerabilities

Same product: AC5
Same vendor: Tenda
Same weakness: CWE-121

V. Comments for CVE-2026-4903

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