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CVE-2025-12258— TOTOLINK A3300R POST Parameter cstecgi.cg setOpModeCfg stack-based 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，该漏洞源于对文件/cgi-bin/cstecgi.cg中参数opmode的错误操作，可能导致栈缓冲区溢出。

CVSS 8.8 · High EPSS 1.02% · P62

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-12258

Vulnerability Information
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Vulnerability Title
TOTOLINK A3300R POST Parameter cstecgi.cg setOpModeCfg stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in TOTOLINK A3300R 17.0.0cu.557_B20221024. Impacted is the function setOpModeCfg of the file /cgi-bin/cstecgi.cg of the component POST Parameter Handler. The manipulation of the argument opmode results in stack-based buffer overflow. The attack may be performed from remote.
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
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，该漏洞源于对文件/cgi-bin/cstecgi.cg中参数opmode的错误操作，可能导致栈缓冲区溢出。
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 A3300R 17.0.0cu.557_B20221024 cpe:2.3:o:totolink:a3300r_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2025-12258

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8760 chars
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III. Intelligence Information for CVE-2025-12258

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Security Blog Posts for CVE-2025-12258 (1)

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

CVE-2025-12239 8.8 HIGH TOTOLINK A3300R cstecgi.cgi setDdnsCfg buffer overflow
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-2025-12259 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-121

V. Comments for CVE-2025-12258

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