What is CVE-2020-36109?

CVE-2020-36109 is a critical-severity vulnerability in Asus Rt-Ax86u, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-02-01.

How severe is CVE-2020-36109?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2020-36109 known to be exploited?

6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Asus Rt-Ax86u

CVE-2020-36109

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.

Vulnerability class: Buffer Overflow

EPSS: 0.042 (89.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

References

cve@mitre.org (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2020-36109?: CVE-2020-36109 is a critical-severity vulnerability in Asus Rt-Ax86u, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2021-02-01.
How severe is CVE-2020-36109?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-36109 known to be exploited?: 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.