CVE-2026-7155

Totolink A8000RU CGI cstecgi.cgi setLoginPasswordCfg os command injection

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Published Apr 27, 2026 CVSS 4.0 · 9.3 Critical EPSS 1.8% KEV · Not listed
Description
A security vulnerability has been detected in Totolink A8000RU 7.1cu.643_b20200521. This impacts the function setLoginPasswordCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument admpass leads to os command injection. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.

Analysis

AI-generated

Technical impact

The vulnerability allows attackers to inject operating‑system commands through the admpass argument of the cstecgi.cgi CGI handler on the router. Manipulation of this parameter results in arbitrary shell command execution, giving the attacker full control over the device. The weakness is a classic command injection problem, indexed as CWE-77 and CWE-78, and the impact is a loss of confidentiality, integrity and availability on the affected device.

Affected Systems

The TOTOLINK A8000RU router, specifically firmware version 7.1cu.643_b20200521, is impacted by this flaw. No other products or firmware revisions are listed in the CVE data.

Risk and Exploitability

The CVSS score of 9.3 signifies severe risk, and the EPSS score is 2%, making it difficult to quantify current exploitation likelihood. The vulnerability is not listed in the CISA KEV catalog, but the remote nature of the attack combined with the high exploit potential raise the risk to a critical level. An attacker who can reach the router’s CGI interface from outside can use the injection to execute arbitrary commands, compromise the device, and potentially pivot to internal network assets.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Update the router firmware to the latest version released by Totolink that addresses the command injection flaw.
  • If a firmware update is not yet available, block external access to the /cgi-bin/cstecgi.cgi endpoint or disable remote management features on the router.
  • Configure firewall rules to detect and block suspicious requests targeting the admpass parameter, and monitor logs for abnormal activity.
  • Restrict management traffic for the router to the local network only when remote management is not required.

Generated by OpenCVE AI on October 25, 2026 at 19:51 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': 'total'}, 'version': '2.0.3'}
Type Values Removed Values Added
First Time appeared Totolink a8000ru
Vendors & Products Totolink a8000ru
Type Values Removed Values Added
Description A security vulnerability has been detected in Totolink A8000RU 7.1cu.643_b20200521. This impacts the function setLoginPasswordCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument admpass leads to os command injection. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used.
Title Totolink A8000RU CGI cstecgi.cgi setLoginPasswordCfg os command injection
First Time appeared Totolink
Totolink a8000ru Firmware
Weaknesses CWE-77
CWE-78
CPEs cpe:2.3:o:totolink:a8000ru_firmware:*:*:*:*:*:*:*:*
Vendors & Products Totolink
Totolink a8000ru Firmware
References
Metrics cvssV2_0

{'score': 10, 'vector': 'AV:N/AC:L/Au:N/C:C/I:C/A:C/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 9.8, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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 28, 2026, 2:47 PM
Reserved
Apr 26, 2026, 8:08 PM

View source JSON

Updated
Apr 28, 2026, 2:47 PM

JSON

Status
Deferred
Published
Apr 27, 2026, 9:16 PM
Modified
Oct 26, 2026, 9:10 PM

View source JSON

No data.

Updated
Oct 25, 2026, 8:00 PM

JSON