Is this vulnerability remotely exploitable over the internet?

Yes, if the router's management interface is exposed to the internet (e.g., remote administration enabled or misconfigured port forwarding), attackers can exploit this issue remotely. If the interface is only accessible from the LAN, exploitation is limited to local network attackers or compromised internal hosts.

Does an attacker need valid credentials to exploit this?

It depends on the router's configuration and any authentication checks around `setAppFilterCfg`. Some firmware bugs occur in handlers that are insufficiently protected or can be reached pre-authentication. Even when authentication is required, weak or default credentials substantially lower the barrier to exploitation.

What is the safest general fix pattern for developers of similar systems?

Remove any dependence on shell command construction for router management logic. Use dedicated system APIs or libraries for configuration changes, strictly validate all parameters (especially those that are conceptually booleans or enums), and avoid ever concatenating user-controllable input into command strings.

Severity:

CRITICAL RISK

(9.8)

OS Command Injection (CWE-78) in Totolink A8000RU setAppFilterCfg Endpoint

CVE-2026-7823

Published:

May 4, 2026

Status:

Deferred

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

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HIGH

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May 6, 2026

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HIGH RISK

HIGH

(8.8)

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Privilege Escalation via Bypassed Access Control

May 6, 2026

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77;CWE-78

Impact:

Remote Code Execution on Network Router

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

Vulnerability Type

Category:

OS Command Injection

CWE:

CWE-77;CWE-78

Impact:

Remote Code Execution on Network Router

Severity:

CRITICAL RISK

(9.8)

CVSS Version:

3.1

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OS Command Injection (CWE-78) in Totolink A8000RU setAppFilterCfg Endpoint

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(8.6)

Server-Side Request Forgery (CWE-918) in OpenClaw Zalo Plugin sendPhoto

HIGH RISK

HIGH

(8.8)

Authorization Bypass (CWE-863) in OpenClaw Matrix Room Control Commands

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

Ship clean & secure code faster

Ship clean & secure code faster

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