Cyber Resilience

CVE-2026-9543

HighRCE

Published: 26 May 2026

Published
26 May 2026
Modified
26 May 2026
KEV Added
—
Patch
—
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 0.0213 79.7th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-9543 is a high-severity Command Injection (CWE-77) vulnerability in Totolink N300RH (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 20.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

A vulnerability has been found in Totolink N300RH 6.1c.1353_B20190305. Affected is the function setPasswordCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Such manipulation of the argument admpass leads to os command injection. The attack can be executed…

more

remotely. The exploit has been disclosed to the public and may 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?

OS command injection in public web management interface (CGI) directly enables remote exploitation of the device and 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
N300RH
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-27 Platform-independent Applications
addresses: CWE-78

Platform-independent apps typically execute inside a managed runtime or sandbox that restricts direct OS command execution, reducing the ability to exploit OS command injection.

SI-10 Information Input Validation
addresses: CWE-78

Validates inputs to block special elements that would alter OS command execution.

References