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Vulnerability record · CVE-2021-43711 · published 4 January 2022

CVE-2021-43711: Totolink ex200 firmware command injection vulnerability

TTotolink · Ex200 Firmware

The downloadFlile.cgi binary file in TOTOLINK EX200 V4.0.3c.7646_B20201211 has a command injection vulnerability when receiving GET parameters. The parameter name can be constructed for unauthenticated command execution.

9.8 CVSS 3.1 Critical EPSS 38% · top 1.5% CWE-77 · Command injection
9.8CVSS 3.1 base score, v2 7.5
38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

The downloadFlile.cgi binary file in TOTOLINK EX200 V4.0.3c.7646_B20201211 has a command injection vulnerability when receiving GET parameters. The parameter name can be constructed for unauthenticated command execution.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/doudoudedi/ToTolink_EX200_Cmmand_Execute/blob/main/ToTolink%20EX200%20Comand%20Injection2.md ExploitThird Party Advisory
https://github.com/doudoudedi/ToTolink_EX200_Cmmand_Execute/blob/main/ToTolink%20EX200%20Comand%20Injection2.md ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-31810Totolink ex200 firmware hard-coded credentials vulnerabilityTOTOLINK EX200 V4.0.3c.7646_B20201211 was discovered to contain a hardcoded password for root at /etc/shadow.sample.EPSS 0.62%9.8CVE-2024-31807Totolink ex200 firmware code injection vulnerabilityTOTOLINK EX200 V4.0.3c.7646_B20201211 was discovered to contain a remote code execution (RCE) vulnerability via the hostTime parameter in the NTPSync…EPSS 1.4%9.1CVE-2024-31815Totolink ex200 firmware insecure direct object reference vulnerabilityIn TOTOLINK EX200 V4.0.3c.7314_B20191204, an attacker can obtain the configuration file without authorization through /cgi-bin/ExportSettings.shEPSS 0.58%8.8CVE-2024-31808Totolink ex200 firmware vulnerabilityTOTOLINK EX200 V4.0.3c.7646_B20201211 was discovered to contain a remote code execution (RCE) vulnerability via the webWlanIdx parameter in the setWe…EPSS 0.93%8.8CVE-2024-31809Totolink ex200 firmware vulnerabilityTOTOLINK EX200 V4.0.3c.7646_B20201211 was discovered to contain a remote code execution (RCE) vulnerability via the FileName parameter in the setUpgr…EPSS 0.98%8.8CVE-2024-31814Totolink ex200 firmware authentication bypass via alternate path vulnerabilityTOTOLINK EX200 V4.0.3c.7646_B20201211 allows attackers to bypass login through the Form_Login function.EPSS 8.3%8.7CVE-2024-7336Totolink ex200 firmware classic buffer overflow vulnerabilityA vulnerability classified as critical was found in TOTOLINK EX200 4.0.3c.7646_B20201211. Affected by this vulnerability is the function loginauth of…EPSS 1.3%8.7CVE-2024-7335Totolink ex200 firmware classic buffer overflow vulnerabilityA vulnerability classified as critical has been found in TOTOLINK EX200 4.0.3c.7646_B20201211. Affected is the function getSaveConfig of the file /cg…EPSS 1.2%

Source: NIST National Vulnerability Database (record CVE-2021-43711), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.