Klarna Checkout for WooCommerce <= 2.13.4 - Denial of Service
Strategic Overview
- Status
- Patched in 2.13.5
- Affected Plugin
- Kustom Checkout for WooCommerce
- Affected Version
<= 2.13.4- CVSS
- 5.3Medium
- Weakness type
- CWE-400 · Uncontrolled Resource Consumption
- CVE
CVE-2024-13925
At a glance
CVE-2024-13925 is a medium-severity Uncontrolled Resource Consumption vulnerability in the Kustom Checkout for WooCommerce WordPress plugin, affecting versions <= 2.13.4. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.13.5; sites on affected versions should update now. Disclosed March 2025.
Vulnerability Overview
The Klarna Checkout for WooCommerce plugin for WordPress is vulnerable to Denial of Service in all versions up to, and including, 2.13.4. This is due to kco_wc_log_js() function not restricting the size of the debug log. This makes it possible for unauthenticated attackers to fill up the log, potentially filling up the disk space and leading to a denial of service.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user.
CWE-400: Uncontrolled Resource Consumption
Kustom Checkout for WooCommerce <= 2.13.4 carries this weakness at kco_wc_log_js(), and reaching it takes a caller who can reach the endpoint. Uncontrolled resource consumption means a request can make the server do an amount of work it never bounds, because the size or repetition of the job is taken from the request rather than capped by the code.
A single caller can hold PHP workers, database connections or disk open long enough to slow the site for everyone, without needing any account or any other flaw. For Kustom Checkout for WooCommerce the fix is 2.13.5: builds <= 2.13.4 are affected, anything from 2.13.5 onward is not.
Remediation
Update to version 2.13.5, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Kustom Checkout for WooCommerce: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Kustom Checkout for WooCommerce 2.13.5 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Other vulnerabilities in Kustom Checkout for WooCommerce
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