Known exploited · Reolink

CVE-2021-40407: Reolink RLC-410W IP Camera OS Command Injection Vulnerability

What it is

Reolink RLC-410W IP cameras contain an authenticated OS command injection vulnerability in the device network settings functionality.

Added December 18, 2024Due January 8, 2025CISA KEV catalog 2026.10.01

Vendor: Reolink
Product: RLC-410W IP Camera
Added to KEV: December 18, 2024
CISA due date: January 8, 2025
Ransomware use: Unknown
Weakness: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

What CISA requires

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.

Forensic triage

What to do now

Find every instance of RLC-410W IP Camera you run, including the forgotten ones, and check its version against the vendor advisory.
Apply the vendor's fix or mitigation, before January 8, 2025 if you are bound by CISA's deadline, sooner if it faces the internet.
Assume it was tried against you already: look for signs of exploitation from the date it was added, not from the day you patched.
Until every instance is patched, block the attack at the edge: a WAF in blocking mode stops OS command injection payloads, including Shellshock.

References

CVE-2021-40407 in the National Vulnerability Database

The Dome

Block it at the edge while you patch

The Dome's WAF runs the OWASP Core Rule Set in blocking mode and stops OS command injection payloads, including Shellshock before they reach your application.

See the Dome

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Train the engineers who fix it

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Source: CISA Known Exploited Vulnerabilities Catalog (public domain), catalog version 2026.10.01.