CVE-2018-5721
8.8 · HIGHOverview
CVE-2018-5721 is a high-severity vulnerability affecting asuswrt-merlin asuswrt-merlin. It was published on January 17, 2018 and has a CVSS 3.1 base score of 8.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
Stack-based buffer overflow in the ej_update_variables function in router/httpd/web.c on ASUS routers (when using software from https://github.com/RMerl/asuswrt-merlin) allows web authenticated attackers to execute code via a request that updates a setting. In ej_update_variables, the length of the variable action_script is not checked, as long as it includes a "_wan_if" substring.
Remediation
Check the references section for vendor advisories and patches from asuswrt-merlin. Update asuswrt-merlin to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| asuswrt-merlin | asuswrt-merlin | 0 | Affected |
Frequently Asked Questions
What is CVE-2018-5721?
CVE-2018-5721 is a high-severity vulnerability affecting asuswrt-merlin asuswrt-merlin. It was published on January 17, 2018 and has a CVSS 3.1 base score of 8.8 (HIGH).
How severe is CVE-2018-5721?
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2018-5721?
Check the references section for vendor advisories and patches from asuswrt-merlin. Update asuswrt-merlin to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2018-5721?
CyberStrike's AI-powered security agents can automatically detect CVE-2018-5721 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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