CVE-2021-40407 Reolink CVE debrief

Who should care

Organizations, IT and security teams, and individual operators that still manage or rely on Reolink RLC-410W IP Cameras. This is especially important for asset owners responsible for embedded or IoT devices that may be difficult to patch or replace.

Technical summary

The supplied corpus identifies CVE-2021-40407 as an OS command injection issue in the Reolink RLC-410W IP Camera. The main defensive significance comes from CISA’s KEV listing, which indicates known exploitation. The source notes also indicate the product may be end-of-life or end-of-service, so remediation may depend on whether Reolink still provides a supported firmware or mitigation path.

Defensive priority

High. Treat as urgent for any deployed RLC-410W devices, because CISA has placed the CVE in the KEV catalog. If the device is end-of-life/end-of-service and no current mitigation exists, retirement or replacement should be prioritized.

Recommended defensive actions

• Inventory all Reolink RLC-410W IP Cameras and determine where they are deployed.
• Check the vendor’s support and download resources for any available firmware update or mitigation path.
• Verify whether the product is end-of-life or end-of-service before relying on patching as a long-term fix.
• If no current mitigation is available, discontinue use and plan replacement in line with CISA’s guidance.
• Reduce exposure of any remaining devices by limiting who can reach them and segmenting them from critical networks.
• Monitor affected environments for unusual device behavior and unexpected configuration changes until remediation is complete.

Evidence notes

Source corpus references CISA’s Known Exploited Vulnerabilities feed entry for CVE-2021-40407, with dateAdded 2024-12-18 and dueDate 2025-01-08. The supplied metadata states the vulnerability name as “Reolink RLC-410W IP Camera OS Command Injection Vulnerability” and includes CISA’s note that the product could be end-of-life or end-of-service. Official reference links provided in the corpus include the CVE record, the NVD detail page, and the CISA KEV catalog entry. No CVSS score was supplied in the corpus.

Official resources