CVE-2021-40423

Name: CVE-2021-40423
Creator: NVD / NIST
Published: 2022-01-28T20:15:12.09+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.34%

Last modified Jun 17, 2026

CVE-2021-40423 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A denial of service vulnerability exists in the cgiserver.cgi API command parser functionality of Reolink RLC-410W v3.0.0.136_20121102. A specially-crafted series of HTTP requests can lead to denial of service. EPSS estimates a 1.34% chance of exploitation in the next 30 days.

Description

A denial of service vulnerability exists in the cgiserver.cgi API command parser functionality of Reolink RLC-410W v3.0.0.136_20121102. A specially-crafted series of HTTP requests can lead to denial of service. An attacker can send an HTTP request to trigger this vulnerability.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.34%

67.7th 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-2022-1432Broken Link, Technical Description, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1432Exploit, Technical Description, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2022-1432Broken Link, Technical Description, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-40423?

How severe is CVE-2021-40423?

CVE-2021-40423 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.34% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40423?

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-2021-40423?

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

Scan your code now

Source: NVD / NIST