CVE-2021-40407: in the CISA KEV catalogue

Reolink RLC-410W IP Camera OS Command Injection Vulnerability . CISA added CVE-2021-40407 to the Known Exploited Vulnerabilities catalogue on 2024-12-18 with a default due date of 2025-01-08. Known ransomware campaign use: Unknown. Forensic triage flag: No.

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

Vendor / product: Reolink RLC-410W IP Camera
CWE: CWE-78
CISA 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.
EPSS: 48%, percentile 98 (scored 2026-11-04)

EPSS puts about 48 in 100 odds (48%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 98% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.

Vendor and reference links (from CISA)

Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.

Data dates. CISA KEV catalogue version 2026.11.04, released 2026-11-04, 1,768 entries (checked 2026-11-04). EPSS model v2026.06.15, scored 2026-11-04, 400,189 CVEs. Sources: CISA and FIRST (EPSS by FIRST; scores generated by Empirical Security). Copied to our own database and refreshed automatically; if a refresh fails, the previous copy keeps serving with its own date.

Frequently asked questions

Is CVE-2021-40407 in the CISA KEV catalogue?

Yes. CISA added CVE-2021-40407 (Reolink RLC-410W IP Camera OS Command Injection Vulnerability ) to the Known Exploited Vulnerabilities catalogue on 2024-12-18. CISA's default due date for it is 2025-01-08.

Is CVE-2021-40407 used in ransomware attacks?

CISA marks known ransomware campaign use as Unknown for CVE-2021-40407. That means CISA lacks confirmation, not that ransomware groups do not use it.

What should I do about CVE-2021-40407?

CISA's 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.

Sources

CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
NVD record for CVE-2021-40407