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.
Published: 2026-04-06
Score: 6.9 Medium
EPSS: 1.1% Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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.

Generated by OpenCVE AI on June 18, 2026 at 14:26 UTC.

Remediation

No vendor fix or workaround currently provided.

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

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Tue, 07 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 07 Apr 2026 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Totolink a7100ru
Vendors & Products Totolink a7100ru

Mon, 06 Apr 2026 20:00:00 +0000

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'}

Subscriptions

Totolink A7100ru A7100ru Firmware
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-04-07T14:40:44.338Z

Reserved: 2026-04-06T09:38:55.422Z

Link: CVE-2026-5677

cve-icon Vulnrichment

Updated: 2026-04-07T14:40:40.329Z

cve-icon NVD

Status : Deferred

Published: 2026-04-06T19:16:30.680

Modified: 2026-06-17T10:59:29.553

Link: CVE-2026-5677

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-18T14:30:15Z

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')