What is CVE-2021-40406?

CVE-2021-40406 is a high-severity vulnerability in Reolink Rlc-410w, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2022-01-28.

How severe is CVE-2021-40406?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Reolink Rlc-410w

CVE-2021-40406

A denial of service vulnerability exists in the cgiserver.cgi session creation functionality of reolink RLC-410W v3.0.0.136_20121102. A specially-crafted HTTP request can lead to prevent users from logging in. An attacker can send an HTTP request to trigger this vulnerability.

Vulnerability class: DoS (Denial of Service)

Published 2022-01-28 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.015 (73.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 73.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.015 · newest: 0.015 · change: 0.000

Affected products

Reolink Rlc-410w
Reolink Rlc-410w Firmware — versions 3.0.0.136_20121102

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

References

talosintelligence.com/vulnerability_reports/TALOS-2021-1423 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-40406?: CVE-2021-40406 is a high-severity vulnerability in Reolink Rlc-410w, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2022-01-28.
How severe is CVE-2021-40406?: High severity. CVSS v3 base score is 7.5 out of 10.