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CVE-2026-44089— Buffer Overflow in Totolink EX1200L router

Quick assessment

Affected
Totolink EX1200L
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TOTOLINK ex1200l是中国TOTOLINK公司的一款双频无线路由器。 Totolink EX1200L 9.3.5u.6146_B20201023版本存在缓冲区错误漏洞，该漏洞源于cgi-bin/cstecgi.cgi登录功能中的缓冲区溢出，可能导致程序崩溃以及远程执行代码。

AI Predicted 9.8 Difficulty: Moderate EPSS 0.31% · P22

Affected Version Matrix 1

VendorProduct Version RangeStatus
Totolink EX1200L 9.3.5u.6146_B20201023 affected
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I. Basic Information for CVE-2026-44089

Vulnerability Information
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Vulnerability Title
Buffer Overflow in Totolink EX1200L router
Source: CVE Program / CVE List V5
Vulnerability Description
Totolink EX1200L router is vulnerable to Buffer Overflow in the login functionality in cgi-bin/cstecgi.cgi endpoint. This vulnerability could be exploited to cause the program to crash and to execute code remotely. This allows the attacker to perform actions as root including reading and editing data, as well as bricking the router. Because vendor contact attempts were unsuccessful, the vulnerability has only been confirmed in version 9.3.5u.6146_B20201023 but may also affect other versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
TOTOLINK EX1200L 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK ex1200l是中国TOTOLINK公司的一款双频无线路由器。 Totolink EX1200L 9.3.5u.6146_B20201023版本存在缓冲区错误漏洞，该漏洞源于cgi-bin/cstecgi.cgi登录功能中的缓冲区溢出，可能导致程序崩溃以及远程执行代码。
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 EX1200L 9.3.5u.6146_B20201023 -

II. Public POCs for CVE-2026-44089

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III. Intelligence Information for CVE-2026-44089

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Security Blog Posts for CVE-2026-44089 (1)

Vendor Pages for CVE-2026-44089 (1)

IV. Related Vulnerabilities

Same product: EX1200L
Same vendor: Totolink
Same weakness: CWE-121

V. Comments for CVE-2026-44089

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