How broadly exploitable is this vulnerability?

This issue can be exploited by any attacker who can reach the router's web interface (typically on the local network and, in some cases, over the Internet if remote management is enabled) while a legitimate user session is active. It does not require prior knowledge of credentials or session tokens.

Does an attacker need valid credentials to exploit this?

No. The flaw allows endpoints to accept empty or invalid session values, so an attacker does not need a valid username, password, or session cookie. The main prerequisite is that some user is currently logged into the router.

What is the safest general fix pattern for developers?

The robust fix is to enforce strict, per-request authentication: every privileged request must present a valid, non-empty, and unexpired session identifier that is cryptographically strong, bound to a specific user and client, and verified before any privileged action occurs. Global "logged-in" flags should be avoided in favor of request-scoped authorization checks.

Severity:

CRITICAL RISK

(9.4)

Authentication Bypass via Flawed Session Validation (CWE-287) in KAYSUS KS-WR3600 Routers

CVE-2025-68717

Published:

Jan 8, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Authentication Bypass

CWE:

CWE-287

Impact:

Unauthorized Administrative Access and Configuration Exposure

Severity:

CRITICAL RISK

(9.4)

CVSS Version:

3.1

Vulnerability Type

Category:

Authentication Bypass

CWE:

CWE-287

Impact:

Unauthorized Administrative Access and Configuration Exposure

Severity:

CRITICAL RISK

(9.4)

CVSS Version:

3.1

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Made with Love in San Francisco

355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Authentication Bypass via Flawed Session Validation (CWE-287) in KAYSUS KS-WR3600 Routers

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

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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