CVE-2021-40404

Name: CVE-2021-40404
Creator: NVD / NIST
Published: 2022-01-28T20:15:11.52+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.23%

Last modified Jun 17, 2026

CVE-2021-40404 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An authentication bypass vulnerability exists in the cgiserver.cgi Login functionality of reolink RLC-410W v3.0.0.136_20121102. A specially-crafted HTTP request can lead to authentication bypass. EPSS estimates a 1.23% chance of exploitation in the next 30 days.

Description

An authentication bypass vulnerability exists in the cgiserver.cgi Login functionality of reolink RLC-410W v3.0.0.136_20121102. A specially-crafted HTTP request can lead to authentication bypass. An attacker can send an HTTP request to trigger this vulnerability.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS Probability

1.23%

65.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Reolink	Rlc-410w Firmware	3.0.0.136_20121102

References

https://talosintelligence.com/vulnerability_reports/TALOS-2021-1420Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1420Exploit, Third Party Advisory

Timeline

Published: Jan 28, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-40404?

How severe is CVE-2021-40404?

CVE-2021-40404 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.23% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40404?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-40404?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST