What’s Vulnerable › Vulnerabilities

CVE-2020-36109

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-02-01 · updated 2026-06-17
• Weakness: CWE-120

Description

ASUS RT-AX86U router firmware below version under 9.0.0.4_386 has a buffer overflow in the blocking_request.cgi function of the httpd module that can cause code execution when an attacker constructs malicious data.

Affected products

• ASUS Rt-Ax86U Firmware: before 9.0.0.4_386 — fixed in 9.0.0.4_386

How to fix

Upgrade to a fixed version: ASUS Rt-Ax86U Firmware 9.0.0.4_386. Check the vendor advisory for mitigations.

References

• https://www.asus.com/Static_WebPage/ASUS-Product-Security-Advisory/
• https://www.asus.com/Static_WebPage/ASUS-Product-Security-Advisory/

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