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CVE-2025-9781— TOTOLINK A702R formFilter sub_4162DC buffer overflow

Quick assessment

Affected
TOTOLINK A702R
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.

TOTOLINK A702r是中国吉翁电子（TOTOLINK）公司的一款路由器设备。 TOTOLINK A702r 4.0.0-B20211108.1423版本存在安全漏洞，该漏洞源于对文件/boafrm/formFilter中参数ip6addr的错误操作导致缓冲区溢出。

CVSS 8.8 · High EPSS 0.66% · P50
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I. Basic Information for CVE-2025-9781

Vulnerability Information
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Vulnerability Title
TOTOLINK A702R formFilter sub_4162DC buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been found in TOTOLINK A702R 4.0.0-B20211108.1423. This affects the function sub_4162DC of the file /boafrm/formFilter. Such manipulation of the argument ip6addr 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
TOTOLINK A702r 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK A702r是中国吉翁电子（TOTOLINK）公司的一款路由器设备。 TOTOLINK A702r 4.0.0-B20211108.1423版本存在安全漏洞，该漏洞源于对文件/boafrm/formFilter中参数ip6addr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
TOTOLINK A702R 4.0.0-B20211108.1423 -

II. Public POCs for CVE-2025-9781

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7400 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-2025-9781

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Proof of Concept for CVE-2025-9781 (2)

Same Patch Batch · TOTOLINK · 2025-09-01 · 5 CVEs total

CVE-2025-9783 8.8 HIGH TOTOLINK A702R formParentControl sub_418030 buffer overflow
CVE-2025-9782 8.8 HIGH TOTOLINK A702R formOneKeyAccessButton sub_4466F8 buffer overflow
CVE-2025-9780 8.8 HIGH TOTOLINK A702R formIpQoS sub_419BE0 buffer overflow
CVE-2025-9779 8.8 HIGH TOTOLINK A702R formFilter sub_4162DC buffer overflow

IV. Related Vulnerabilities

Same product: A702R
Same vendor: TOTOLINK
Same weakness: CWE-120

V. Comments for CVE-2025-9781

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