Cyber Resilience

CVE-2026-9384

HighRCE

Published: 24 May 2026

Published
24 May 2026
Modified
26 May 2026
KEV Added
—
Patch
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CVSS Score v4 8.9 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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0173 74.8th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-9384 is a high-severity Command Injection (CWE-77) vulnerability in Totolink A8000RU (inferred from references). Its CVSS base score is 8.9 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 25.2% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and AC-17 (Remote Access).

Deeper analysis

The vulnerability CVE-2026-9384 affects the Totolink A8000RU router running firmware version 7.1cu.643_b20200521. It resides in the setDiagnosisCfg function of the /cgi-bin/cstecgi.cgi file within the Web Management Interface, where manipulation of the ip argument enables operating system command injection as indicated by CWE-77 and CWE-78.

An unauthenticated remote attacker can exploit the flaw over the network without user interaction by submitting a crafted HTTP request to the web interface, resulting in arbitrary command execution that carries high impact on confidentiality, integrity, and availability according to the CVSS 8.9 rating.

The associated exploit has been publicly released. The EPSS score stands at 0.0125 with no material change from its recorded peak. Available references include a detailed disclosure on GitHub, multiple Vuldb entries, and the vendor site, though they contain no explicit mitigation or patch details.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

A vulnerability was found in Totolink A8000RU 7.1cu.643_b20200521. This vulnerability affects the function setDiagnosisCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. The manipulation of the argument ip results in os command injection. The attack can be executed…

more

remotely. The exploit has been made public and could be used.

CWE(s)
CWE-77CWE-78

Related Threats

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 →
T1059.004 Unix Shell Execution
Adversaries may abuse Unix shell commands and scripts for execution.
attack.mitre.org →
Why these techniques?

Direct remote OS command injection in web management interface enables T1190 (public-facing app exploitation) and T1059.004 (Unix shell command execution).

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

CVEs Like This One

CVE-2026-7204Shared CWE-77, CWE-78
CVE-2026-2152Shared CWE-77, CWE-78
CVE-2026-5677Shared CWE-77, CWE-78
CVE-2026-2157Shared CWE-77, CWE-78
CVE-2026-7136Shared CWE-77, CWE-78
CVE-2026-7121Shared CWE-77, CWE-78
CVE-2026-9387Shared CWE-77, CWE-78
CVE-2026-9477Shared CWE-77, CWE-78
CVE-2026-2063Shared CWE-77, CWE-78
CVE-2026-2847Shared CWE-77, CWE-78

Affected Assets

Totolink
A8000RU
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly requires validation of the 'ip' argument in setDiagnosisCfg to block the OS command injection payload.

SC-7 Boundary Protection partial match
prevent

Restricts network exposure of the unauthenticated /cgi-bin/cstecgi.cgi web interface that accepts the malicious request.

AC-17 Remote Access partial match
prevent

Enforces authorization and encryption requirements on remote management connections to the vulnerable router interface.

References