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CVE-2026-5101— Totolink A3300R Parameter cstecgi.cgi setLanCfg command injection

Quick assessment

Affected
Totolink A3300R
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 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版本存在命令注入漏洞，该漏洞源于对文件/cgi-bin/cstecgi.cgi中参数lanIp的操作不当，可能导致命令注入。

CVSS 6.3 · Medium EPSS 3.55% · P89
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I. Basic Information for CVE-2026-5101

Vulnerability Information
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Vulnerability Title
Totolink A3300R Parameter cstecgi.cgi setLanCfg command injection
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was identified in Totolink A3300R 17.0.0cu.557_b20221024. This affects the function setLanCfg of the file /cgi-bin/cstecgi.cgi of the component Parameter Handler. The manipulation of the argument lanIp leads to command injection. Remote exploitation of the attack is possible. The exploit is publicly available and might be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在命令中使用的特殊元素转义处理不恰当(命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
TOTOLINK A3300R 命令注入漏洞
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版本存在命令注入漏洞，该漏洞源于对文件/cgi-bin/cstecgi.cgi中参数lanIp的操作不当，可能导致命令注入。
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-2026-5101

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III. Intelligence Information for CVE-2026-5101

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Vendor Advisories for CVE-2026-5101 (2)

Other References for CVE-2026-5101 (1)

Same Patch Batch · Totolink · 2026-03-29 · 3 CVEs total

CVE-2026-5030 6.3 MEDIUM Totolink NR1800X Telnet Service cstecgi.cgi NTPSyncWithHost command injection
CVE-2026-5020 6.3 MEDIUM Totolink A3600R Parameter cstecgi.cgi setNoticeCfg command injection

IV. Related Vulnerabilities

Same product: A3300R
Same vendor: Totolink
Same weakness: CWE-77

V. Comments for CVE-2026-5101

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