CVE-2026-5677

Totolink A7100RU cstecgi.cgi CsteSystem 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 security flaw has been discovered in Totolink A7100RU 7.4cu.2313_b20191024. Impacted is the function CsteSystem of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument resetFlags results in os command injection. The attack may be initiated remotely. The exploit has been released to the public and may be used for attacks.

Analysis

AI-generated

Technical impact

The vulnerability is an OS command injection flaw in the CsteSystem CGI function of /cgi-bin/cstecgi.cgi on Totolink A7100RU routers. By manipulating the resetFlags argument, a remote attacker can inject arbitrary shell commands and potentially gain full control of the device, compromising both the router and any traffic it handles. The flaw is rooted in unsanitized input handling, typical of CWE‑77 and CWE‑78.

Affected Systems

Totolink A7100RU routers running firmware version 7.4cu.2313_b20191024. No other firmware versions are indicated as affected in the available data.

Risk and Exploitability

The CVSS score of 6.9 indicates moderate severity, while an EPSS score of 1% reflects a low but non‑zero likelihood of exploitation. The vulnerability is not listed in the CISA KEV catalog. Because the attack may be initiated remotely, the likely vector is a crafted HTTP request to /cgi-bin/cstecgi.cgi that injects malicious resetFlags values. The exploit is publicly released, so real‑world attacks are plausible on devices exposed to external networks.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Apply the latest firmware update supplied by Totolink that resolves the cstecgi.cgi command injection flaw.
  • Block or restrict external access to the /cgi-bin/cstecgi.cgi endpoint using the router’s firewall or an external firewall to prevent exploitation.
  • Monitor router logs for unusual HTTP requests or unexpected command execution patterns that may indicate attempts to exploit the injection flaw.

Generated by OpenCVE AI on June 18, 2026 at 14:26 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 security flaw has been discovered in Totolink A7100RU 7.4cu.2313_b20191024. Impacted is the function CsteSystem of the file /cgi-bin/cstecgi.cgi. Performing a manipulation of the argument resetFlags results in os command injection. The attack may be initiated remotely. The exploit has been released to the public and may be used for attacks.
Title Totolink A7100RU cstecgi.cgi CsteSystem 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, 2:40 PM
Reserved
Apr 6, 2026, 9:38 AM

View source JSON

Updated
Apr 7, 2026, 2:40 PM

JSON

Status
Deferred
Published
Apr 6, 2026, 7:16 PM
Modified
Jul 20, 2026, 8:10 PM

View source JSON

No data.

Updated
Jun 18, 2026, 2:30 PM

JSON