What is CVE-2021-46009?

CVE-2021-46009 is a critical-severity vulnerability in Totolink A3100r, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2022-03-30.

How severe is CVE-2021-46009?

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

Auth bypass in Totolink A3100r

CVE-2021-46009

In Totolink A3100R V5.9c.4577, multiple pages can be read by curl or Burp Suite without authentication. Additionally, admin configurations can be set without cookies.

Vulnerability class: Broken Authentication

Published 2022-03-30 · last modified 2026-07-09.

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.

EPSS exploit prediction

EPSS: 0.125 (96.1th percentile), scored 2026-09-30.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 96th percentile — 96.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.125 · newest: 0.125 · change: 0.000

Affected products

Totolink A3100r
Totolink A3100r Firmware — versions 5.9c.4577

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

af854a3a-2127-422b-91ae-364da2661108 (Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Broken Link)
hackmd.io/-riYp6Q-ReCx-dKKWFBTLg (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-46009?: CVE-2021-46009 is a critical-severity vulnerability in Totolink A3100r, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2022-03-30.
How severe is CVE-2021-46009?: Critical severity. CVSS v3 base score is 9.8 out of 10.