Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2025-8940— Tenda AC20 saveParentControlInfo strcpy buffer overflow

Quick assessment

Affected
Tenda AC20
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 AC20是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC20 16.03.08.12及之前版本存在安全漏洞，该漏洞源于文件/goform/saveParentControlInfo中参数Time的错误操作导致缓冲区溢出。

CVSS 8.8 · High EPSS 0.87% · P57

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2025-8940

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Tenda AC20 saveParentControlInfo strcpy buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in Tenda AC20 up to 16.03.08.12. Affected by this vulnerability is the function strcpy of the file /goform/saveParentControlInfo. The manipulation of the argument Time leads to buffer overflow. The attack can be launched remotely. The exploit has been disclosed to the public 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
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 AC20 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Tenda AC20是中国腾达（Tenda）公司的一款无线路由器。 Tenda AC20 16.03.08.12及之前版本存在安全漏洞，该漏洞源于文件/goform/saveParentControlInfo中参数Time的错误操作导致缓冲区溢出。
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 AC20 16.03.08.0 -

II. Public POCs for CVE-2025-8940

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8840 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-2025-8940

请登录查看更多情报信息。

Proof of Concept for CVE-2025-8940 (1)

Same Patch Batch · Tenda · 2025-08-14 · 5 CVEs total

CVE-2025-8958 8.8 HIGH Tenda TX3 fast_setting_wifi_set stack-based overflow
CVE-2025-8939 8.8 HIGH Tenda AC20 WifiGuestSet buffer overflow
CVE-2025-8980 6.6 MEDIUM Tenda G1 Firmware Update check_upload_file data authenticity
CVE-2025-8979 6.6 MEDIUM Tenda AC15 Firmware Update check_fw data authenticity

IV. Related Vulnerabilities

Same product: AC20
Same vendor: Tenda
Same weakness: CWE-120

V. Comments for CVE-2025-8940

No comments yet

Leave a comment