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CVE-2025-12239— TOTOLINK A3300R cstecgi.cgi setDdnsCfg buffer overflow

Quick assessment

Affected
TOTOLINK A3300R
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 A3300R是中国吉翁电子（TOTOLINK）公司的一款无线路由器。 TOTOLINK A3300R 17.0.0cu.557_B20221024版本存在安全漏洞，该漏洞源于文件/cgi-bin/cstecgi.cgi中函数setDdnsCfg存在缓冲区溢出，可能导致远程执行任意代码。

CVSS 8.8 · High EPSS 0.84% · P56

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-12239

Vulnerability Information
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Vulnerability Title
TOTOLINK A3300R cstecgi.cgi setDdnsCfg buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in TOTOLINK A3300R 17.0.0cu.557_B20221024. The impacted element is the function setDdnsCfg of the file /cgi-bin/cstecgi.cgi. Executing manipulation can lead to buffer overflow. The attack may be performed from remote. The exploit has been made available to the public and could be exploited.
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 A3300R 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK A3300R是中国吉翁电子（TOTOLINK）公司的一款无线路由器。 TOTOLINK A3300R 17.0.0cu.557_B20221024版本存在安全漏洞，该漏洞源于文件/cgi-bin/cstecgi.cgi中函数setDdnsCfg存在缓冲区溢出，可能导致远程执行任意代码。
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 A3300R 17.0.0cu.557_B20221024 -

II. Public POCs for CVE-2025-12239

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9493 chars
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POC zip download
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III. Intelligence Information for CVE-2025-12239

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Vendor Advisories for CVE-2025-12239 (1)

Proof of Concept for CVE-2025-12239 (1)

Same Patch Batch · TOTOLINK · 2025-10-27 · 6 CVEs total

CVE-2025-12240 8.8 HIGH TOTOLINK A3300R cstecgi.cgi setDmzCfg buffer overflow
CVE-2025-12241 8.8 HIGH TOTOLINK A3300R POST Parameter cstecgi.cgi setLanguageCfg stack-based overflow
CVE-2025-12258 8.8 HIGH TOTOLINK A3300R POST Parameter cstecgi.cg setOpModeCfg stack-based overflow
CVE-2025-12259 8.8 HIGH TOTOLINK A3300R POST Parameter cstecgi.cgi setScheduleCfg stack-based overflow
CVE-2025-12260 8.8 HIGH TOTOLINK A3300R POST Parameter cstecgi.cgi setSyslogCfg stack-based overflow

IV. Related Vulnerabilities

Same product: A3300R
Same vendor: TOTOLINK
Same weakness: CWE-120

V. Comments for CVE-2025-12239

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