Cyber Posture

CVE-2026-5997

Critical

Published: 10 April 2026

Published
10 April 2026
Modified
27 April 2026
KEV Added
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Patch
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CVSS Score 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0125 79.5th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Description

A vulnerability was detected in Totolink A7100RU 7.4cu.2313_b20191024. The impacted element is the function setLoginPasswordCfg of the file /cgi-bin/cstecgi.cgi of the component CGI Handler. The manipulation of the argument admpass results in os command injection. It is possible to launch…

more

the attack remotely. The exploit is now public and may be used.

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match
prevent

Directly prevents OS command injection by requiring validation of untrusted inputs like the admpass argument in the setLoginPasswordCfg CGI function.

SI-2 Flaw Remediation good match
prevent

Mandates identification, reporting, and correction of the specific command injection flaw in /cgi-bin/cstecgi.cgi to eliminate the vulnerability.

IA-8 Identification and Authentication (Non-organizational Users) good match
prevent

Blocks unauthenticated remote exploitation of the vulnerable CGI handler by enforcing identification and authentication for non-organizational users accessing the system.

Security SummaryAI

CVE-2026-5997 is an OS command injection vulnerability in the Totolink A7100RU router running firmware version 7.4cu.2313_b20191024. The flaw affects the setLoginPasswordCfg function in the /cgi-bin/cstecgi.cgi file of the CGI Handler component, where manipulation of the admpass argument enables command injection. Published on 2026-04-10, it is associated with CWE-77 and CWE-78.

The vulnerability is exploitable remotely by unauthenticated attackers with low complexity and no user interaction required, earning a CVSS v3.1 base score of 9.8 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). Successful exploitation grants high impacts on confidentiality, integrity, and availability, allowing attackers to execute arbitrary OS commands and potentially fully compromise the device.

Advisories reference a public exploit in a GitHub repository at https://github.com/Litengzheng/vuldb_new/blob/main/A7100RU/vul_169/README.md, along with VulDB entries at https://vuldb.com/vuln/356551 and related pages. The Totolink website at https://www.totolink.net/ is listed, but no specific patches or mitigations are detailed in the provided references.

Details

CWE(s)
CWE-77CWE-78

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1059.008 Network Device CLI Execution
Adversaries may abuse scripting or built-in command line interpreters (CLI) on network devices to execute malicious command and payloads.
attack.mitre.org →
Why these techniques?

The vulnerability is a remote unauthenticated OS command injection in a public-facing web CGI interface on a router, directly enabling T1190 (Exploit Public-Facing Application) and facilitating arbitrary command execution matching T1059.008 (Network Device CLI).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

References