CVE-2020-36109

Name: CVE-2020-36109
Creator: NVD / NIST
Published: 2021-02-01T14:15:12.303+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 4.21%

Last modified Jun 17, 2026

CVE-2020-36109 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 4.21% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

4.21%

89.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Asus	Rt-Ax86u Firmware	< 9.0.0.4_386

References

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

Timeline

Published: Feb 1, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-36109?

How severe is CVE-2020-36109?

CVE-2020-36109 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 4.21% probability of exploitation in the next 30 days.

How do I fix CVE-2020-36109?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-36109?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST