Is this vulnerability remotely exploitable?

Yes. An attacker who can send HTTP(S) requests to the affected SvelteKit application can potentially exploit it, provided the application has at least one prerendered route and is deployed in a configuration that relies on unvalidated Host or origin metadata.

What level of access does an attacker need?

The attacker generally only needs network access to the application's public endpoint. No authenticated session is inherently required to trigger the DoS behavior or attempt SSRF, though additional access controls and network restrictions can significantly reduce exposure.

What is the safest general fix pattern?

The safest pattern is to: - Treat Host and Origin as untrusted by default, - Configure a fixed, trusted origin in the application runtime, - Place the app behind a reverse proxy that strictly validates Host headers, and - Ensure prerender logic does not depend on untrusted input for constructing internal or outbound URLs.

Severity:

CRITICAL RISK

(9.1)

Server-Side Request Forgery and DoS (CWE-918, CWE-248) in SvelteKit Prerendered Routes

CVE-2025-67647

Published:

Jan 15, 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:

Server-Side Request Forgery (SSRF) and Availability Weakness

CWE:

CWE-248;CWE-918

Impact:

Denial of Service and Potential Server-Side Request Forgery

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Server-Side Request Forgery (SSRF) and Availability Weakness

CWE:

CWE-248;CWE-918

Impact:

Denial of Service and Potential Server-Side Request Forgery

Severity:

CRITICAL RISK

(9.1)

CVSS Version:

3.1

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Server-Side Request Forgery and DoS (CWE-918, CWE-248) in SvelteKit Prerendered Routes

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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