Which products and versions are affected by CVE-2026-9406?

Affected: A8000ru Firmware (Totolink); A8000RU. The full list is in the CVE brief.

Is CVE-2026-9406 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2026-9406 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2026-9406?

Public exploit code is available.

Is there a fix for CVE-2026-9406?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2026-9406 be patched?

Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

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Vulnerability Intelligence

CVE-2026-9406

HighPublic exploit

Totolink A8000RU Web Management cstecgi.cgi setRemoteCfg os command injection

Published May 24, 2026 · Updated Jul 23, 2026 · Also known as EUVD-2026-31606, GHSA-wr4g-w636-jw9m

Key Facts

Patch immediately

CVE-2026-9406 is a high-severity vulnerability (CVSS 8.9 v4) affecting A8000ru Firmware (Totolink), A8000RU.
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 3.3% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

CVSS 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 (30-day exploit likelihood)

3.3%

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2026-9406 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

A weakness has been identified in Totolink A8000RU 7.1cu.643_b20200521. Affected is the function setRemoteCfg of the file /cgi-bin/cstecgi.cgi of the component Web Management Interface. Executing a manipulation of the argument enable can lead to os command injection. The attack can be executed remotely. The exploit has been made available to the public and could be used for attacks.

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
A8000ru FirmwareTotolink	See advisory	n/a
A8000RU	See advisory	n/a

Timeline

Publicly disclosed
May 24, 2026
Last updated
Jul 23, 2026

Weakness Type

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')

References

FAQ

Common Questions.

A weakness has been identified in Totolink A8000RU 7.1cu.643_b20200521.
Affected: A8000ru Firmware (Totolink); A8000RU. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Is CVE-2026-9406 Running On Your Attack Surface?

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