CVE-2026-5678

Totolink A7100RU cstecgi.cgi setScheduleCfg os command injection

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Published Apr 6, 2026 CVSS 4.0 · 6.9 Medium EPSS 1.3% KEV · Not listed
Description
A weakness has been identified in Totolink A7100RU 7.4cu.2313_b20191024. The affected element is the function setScheduleCfg of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument mode can lead to os command injection. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.

Analysis

AI-generated

Technical impact

The vulnerability is an OS command injection in the setScheduleCfg function of /cgi-bin/cstecgi.cgi on the Totolink A7100RU router. An attacker can craft the mode argument to cause the router to execute arbitrary shell commands, giving full control confidentiality, integrity, and availability of the device and any connected network. The weakness aligns with CWE‑77 and CWE‑78.

Affected Systems

The flaw affects Totolink A7100RU routers running firmware version 7.4cu.2313_b20191024. The vendor and product details are confirmed in the CVE references. No other products or versions are listed.

Risk and Exploitability

The CVSS score of 6.9 denotes medium severity, and the exploit is publicly available, indicating a realistic risk of exploitation. The EPSS score of 1% suggests a low but non‑zero likelihood of exploitation. The vulnerability is not flagged in the CISA KEV catalog. The attack can be executed remotely by sending a manipulated mode parameter to the vulnerable CGI endpoint.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Verify current firmware version and download the latest Totolink A7100RU firmware that fixes the command injection; apply the update immediately.
  • If no patch is available, block remote access to /cgi-bin/cstecgi.cgi or disable remote web administration on the router.
  • Change the router’s default administrator credentials to a strong, unique password.
  • Monitor device logs and network traffic for suspicious mode parameter usage, and review any unexpected CGI calls.
  • Reach out to Totolink support for further guidance and potential interim security measures.

Generated by OpenCVE AI on June 18, 2026 at 09:28 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 weakness has been identified in Totolink A7100RU 7.4cu.2313_b20191024. The affected element is the function setScheduleCfg of the file /cgi-bin/cstecgi.cgi. Executing a manipulation of the argument mode can lead to os command injection. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks.
Title Totolink A7100RU cstecgi.cgi setScheduleCfg 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, 2:05 PM
Reserved
Apr 6, 2026, 9:41 AM

View source JSON

Updated
Apr 7, 2026, 2:05 PM

JSON

Status
Deferred
Published
Apr 6, 2026, 7:16 PM
Modified
Jul 24, 2026, 9:10 AM

View source JSON

No data.

Updated
Jun 18, 2026, 9:30 AM

JSON