What is CVE-2021-40407?

CVE-2021-40407 is a high-severity vulnerability in Reolink Rlc-410w, classified under OS Command Injection. CVSS score: 7.2/10. Published 2022-01-28.

How severe is CVE-2021-40407?

High severity. CVSS v3 base score is 7.2 out of 10.

Is CVE-2021-40407 known to be exploited?

Yes. CVE-2021-40407 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-12-18), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

RCE in Reolink Rlc-410w

CVE-2021-40407

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->domain variable, that has the value of the domain parameter provided through the SetDdns API, is not validated properly. This would lead to an OS command injection. An attacker can send an HTTP request to trigger this vulnerability.

Vulnerability class: Command Injection (OS Command Injection)

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

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.476 (98.8th percentile), scored 2026-10-18.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.476 · newest: 0.476 · change: 0.000

Affected products

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

Weakness classification (CWE)

CWE-78 — OS Command Injection

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2024-12-18. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2025-01-08.

Required action: The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization if a current mitigation is unavailable.

Public proof-of-concept exploits

References

talosintelligence.com/vulnerability_reports/TALOS-2021-1424 (Exploit, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2021-40407?: CVE-2021-40407 is a high-severity vulnerability in Reolink Rlc-410w, classified under OS Command Injection. CVSS score: 7.2/10. Published 2022-01-28.
How severe is CVE-2021-40407?: High severity. CVSS v3 base score is 7.2 out of 10.
Is CVE-2021-40407 known to be exploited?: Yes. CVE-2021-40407 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-12-18), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.