CVE-2021-40408

Name: CVE-2021-40408
Creator: NVD / NIST
Published: 2022-01-28T20:15:11.65+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.66%

Last modified Jun 17, 2026

CVE-2021-40408 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An OS command injection vulnerability exists in the device network settings functionality of reolink RLC-410W v3.0.0.136_20121102. At [1] or [2], based on DDNS type, the ddns->username variable, that has the value of the userName parameter provided through the SetDdns API, is not validated properly. EPSS estimates a 3.66% chance of exploitation in the next 30 days.

Description

An OS command injection vulnerability exists in the device network settings functionality of reolink RLC-410W v3.0.0.136_20121102. At [1] or [2], based on DDNS type, the ddns->username variable, that has the value of the userName parameter provided through the SetDdns API, is not validated properly. This would lead to an OS command injection.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

3.66%

88.2th 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-2021-1424Exploit, Third Party Advisory
https://talosintelligence.com/vulnerability_reports/TALOS-2021-1424Exploit, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2021-40408?

How severe is CVE-2021-40408?

CVE-2021-40408 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.66% probability of exploitation in the next 30 days.

How do I fix CVE-2021-40408?

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-2021-40408?

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

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Source: NVD / NIST