CVE-2026-5690

Totolink A7100RU cstecgi.cgi setRemoteCfg os command injection

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Published Apr 6, 2026 CVSS 4.0 · 6.9 Medium EPSS 1.6% KEV · Not listed
Description
A flaw has been found in Totolink A7100RU 7.4cu.2313_b20191024. The impacted element is the function setRemoteCfg of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument enable can lead to os command injection. The attack can be executed remotely. The exploit has been published and may be used.

Analysis

AI-generated

Technical impact

The vulnerability resides in the setRemoteCfg function of /cgi-bin/cstecgi.cgi on Totolink A7100RU routers running firmware 7.4cu.2313_b20191024. Manipulating the enable argument allows an attacker to inject arbitrary OS commands, representing classic command injection weaknesses (CWE-77 and CWE-78). The flaw enables remote execution of system commands with the privileges of the router, potentially compromising the device and the network it manages.

Affected Systems

Devices affected are Totolink A7100RU routers supplied with firmware 7.4cu.2313_b20191024. No other vendors or products are listed in the CNA data.

Risk and Exploitability

The CVSS base score of 6.9 indicates moderate severity, and the EPSS score of <1% indicates a very low probability of exploitation. The vulnerability is not yet catalogued in CISA’s KEV list, but an exploit has been published. The flaw can be triggered remotely, presumably via HTTP requests to the setRemoteCfg endpoint, which can be automated and does not require authentication.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest firmware update for Totolink A7100RU that contains the OS command injection fix.
  • If a patch is not yet available, block or disable the cstecgi.cgi endpoint or remote configuration functionality.
  • Configure network firewall or router ACLs to restrict management interface access to trusted IPs or a VPN tunnel.
  • Monitor router logs for suspicious requests to cstecgi.cgi and investigate any anomalies.

Generated by OpenCVE AI on April 21, 2026 at 23:26 UTC.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}
Type Values Removed Values Added
First Time appeared Totolink a7100ru
Vendors & Products Totolink a7100ru
Type Values Removed Values Added
Description A flaw has been found in Totolink A7100RU 7.4cu.2313_b20191024. The impacted element is the function setRemoteCfg of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument enable can lead to os command injection. The attack can be executed remotely. The exploit has been published and may be used.
Title Totolink A7100RU cstecgi.cgi setRemoteCfg os command injection
First Time appeared Totolink
Totolink a7100ru Firmware
Weaknesses CWE-77
CWE-78
CPEs cpe:2.3:o:totolink:a7100ru_firmware:*:*:*:*:*:*:*:*
Vendors & Products Totolink
Totolink a7100ru Firmware
References
Metrics cvssV2_0

{'score': 7.5, 'vector': 'AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 7.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}
Weaknesses
  • CWE-77

    Improper Neutralization of Special Elements used in a Command ('Command Injection')

  • CWE-78

    Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Sources

Status
PUBLISHED
Assigner
VulDB
Published
Updated
Apr 7, 2026, 3:08 PM
Reserved
Apr 6, 2026, 10:27 AM

View source JSON

Updated
Apr 7, 2026, 2:34 PM

JSON

Status
Deferred
Published
Apr 6, 2026, 11:16 PM
Modified
Jul 24, 2026, 9:10 AM

View source JSON

No data.

Updated
Apr 21, 2026, 11:30 PM

JSON