CVE-2020-36109
ASUS RT-AX86U router firmware below version under 9.0.0.4_386 has a buffer overflow in the...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2020-36109- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-120
- Updated
- 2026-11-02
CVE ListNo score
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.
- Record
CVE-2020-36109- Updated
- 2026-11-02
EUVDEUVD-2020-23687No score
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.
- Record
EUVD-2020-23687- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-mcj9-phjm-5g8vNo score
ASUS RT-AX86U router firmware below version under 9.0.0.4_386 has a buffer overflow in the...
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.
- Record
GHSA-mcj9-phjm-5g8v- Weakness
- CWE-120
- Updated
- 2026-11-02
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | tin-z/CVE-2020-36109-POC | 2021-02-13 |
| PoC in GitHub | sunn1day/CVE-2020-36109-POC | 2022-04-20 |
History
| Recorded | Changed | Sources |
|---|---|---|
| exploits, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-36109 is a critical vulnerability (CVSS 9.8) in Asus Rt-ax86u Firmware, published February 1, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 4.21%, the 91st percentile. No source names a fixed version.