Cyber Resilience

CVE-2026-9475

HighRCE

Published: 25 May 2026

Published
25 May 2026
Modified
26 May 2026
KEV Added
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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 0.0191 77.2th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-9475 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 22.8% 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 AC-3 (Access Enforcement) and SI-10 (Information Input Validation).

Deeper analysis

A vulnerability was identified in the Totolink A8000RU router running firmware version 7.1cu.643_b20200521. It resides in the setIpQosRules function of the /cgi-bin/cstecgi.cgi file within the web management interface and stems from improper handling of the Comment argument, resulting in operating system command injection. The issue is tracked under CWE-77 and CWE-78 and carries a CVSS 4.0 score of 8.9, reflecting network-accessible attack vectors that require no authentication or user interaction.

Remote, unauthenticated attackers can supply a crafted Comment value to execute arbitrary operating system commands on the device. Successful exploitation grants full control over confidentiality, integrity, and availability of the affected router, consistent with the high impact metrics in the CVSS vector. The exploit code has been publicly released.

The EPSS score remains flat at 0.0125 with no material increase after disclosure. Available references consist of a proof-of-concept repository, VulDB entries, and the vendor site, but contain no details on patches or mitigation steps.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

A vulnerability was determined in Totolink A8000RU 7.1cu.643_b20200521. This affects the function setIpQosRules of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. This manipulation of the argument Comment causes os command injection. Remote exploitation of the attack is possible.…

more

The exploit has been publicly disclosed and may be utilized.

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 →
Why these techniques?

Remote OS command injection in web management interface directly enables T1190 (Exploit Public-Facing Application).

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

CVEs Like This One

CVE-2026-9434Shared CWE-77, CWE-78
CVE-2026-9388Shared CWE-77, CWE-78
CVE-2026-7240Shared CWE-77, CWE-78
CVE-2026-9407Shared CWE-77, CWE-78
CVE-2026-9436Shared CWE-77, CWE-78
CVE-2025-9727Shared CWE-77, CWE-78
CVE-2026-9478Shared CWE-77, CWE-78
CVE-2026-7204Shared CWE-77, CWE-78
CVE-2026-2152Shared CWE-77, CWE-78
CVE-2026-5677Shared 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 and sanitization of the Comment argument to block OS command injection in setIpQosRules.

AC-3 Access Enforcement good match
prevent

Enforces authentication and authorization on the web management interface before any access to cstecgi.cgi functions is granted.

SC-7 Boundary Protection partial match
prevent

Restricts network access to the router's management interface from untrusted sources, reducing remote unauthenticated attack surface.

References