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CVE-2025-14656— Tenda AC20 openSchedWifi httpd 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版本存在安全漏洞，该漏洞源于对文件/goform/openSchedWifi中参数schedStartTime/schedEndTime的错误操作，可能导致缓冲区溢出。

CVSS 8.8 · High EPSS 0.72% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-14656

Vulnerability Information
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Vulnerability Title
Tenda AC20 openSchedWifi httpd buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in Tenda AC20 16.03.08.12. This affects the function httpd of the file /goform/openSchedWifi. Executing a manipulation of the argument schedStartTime/schedEndTime can lead to buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could 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
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版本存在安全漏洞，该漏洞源于对文件/goform/openSchedWifi中参数schedStartTime/schedEndTime的错误操作，可能导致缓冲区溢出。
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 16.03.08.12 cpe:2.3:o:tenda:ac20_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2025-14656

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7646 chars
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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
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III. Intelligence Information for CVE-2025-14656

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Vendor Advisories for CVE-2025-14656 (3)

Other References for CVE-2025-14656 (1)

Same Patch Batch · Tenda · 2025-12-14 · 4 CVEs total

CVE-2025-14665 9.8 CRITICAL Tenda WH450 HTTP Request DhcpListClient stack-based overflow
CVE-2025-14655 8.8 HIGH Tenda AC20 httpd SetSysAutoRebbotCfg formSetRebootTimer stack-based overflow
CVE-2025-14654 8.8 HIGH Tenda AC20 httpd setPptpUserList formSetPPTPUserList stack-based overflow

IV. Related Vulnerabilities

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

V. Comments for CVE-2025-14656

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