TI-2020-18447 Aliases CVE-2020-36109 GHSA-mcj9-phjm-5g8v

ASUS RT-AX86U router firmware below version under 9.0.0.4_386 has a buffer overflow in…

MEDIUM 49CWE-120Published 2021-02-01 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.04207 91st percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:o:asus:rt-ax86u_firmware::::::::	before 9.0.0.4_386	Vulnerable	ASUS
cpe:2.3:h:asus:rt-ax86u:-:::::::*	not specified by NVD	Running on	ASUS

cpe:2.3:o:asus:rt-ax86u_firmware:*:*:*:*:*:*:*:* Versions before 9.0.0.4_386 Vulnerable ·ASUS
cpe:2.3:h:asus:rt-ax86u:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·ASUS

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2020-36109
2026-10-03 Alias added: GHSA-mcj9-phjm-5g8v

References

Advisory 1

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

TI-2022-09749 Out-of-bounds write in Asuswrt-Merlin New Gen CVSS 3.1CRITICAL 9.8
TI-2021-18228 A brute-force protection bypass in CAPTCHA protection in ASUS ROG Rapture GT-AX11000… CVSS 3.1CRITICAL 9.8
TI-2021-02220 In ASUS RT-AX3000, ZenWiFi AX (XT8), RT-AX88U, and other ASUS routers with firmware <… CVSS 3.1HIGH 7.5
TI-2021-19533 ASUS RT-A88U 3.0.0.4.386_45898 is vulnerable to Cross Site Scripting (XSS). CVSS 3.1CRITICAL 9.0
TI-2021-18229 An HTTP request smuggling in web application in ASUS ROG Rapture GT-AX11000, RT-AX3000… CVSS 3.1HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences