Security readout for executives and security teams
Plain-English summary
This vulnerability can let an unauthenticated remote attacker crash and reboot a specific Reolink camera by sending a malformed HTTP request. The main business impact is loss of camera availability, which can interrupt monitoring, evidence capture, and physical security visibility.
Executive priority
Treat as high priority for sites relying on affected cameras for security monitoring. The issue affects availability rather than data theft, but repeated reboots can create surveillance blind spots.
Technical view
CVE-2021-44415 is improper input validation in the cgiserver.cgi JSON command parser for Reolink RLC-410W v3.0.0.136_20121102. A malformed ModifyUser parameter that is not an object can trigger a denial of service and reboot. CVSS is 8.6 due to network reachability, no authentication, and high availability impact.
Likely exposure
Exposure is most likely where affected Reolink RLC-410W cameras expose their HTTP management or CGI interface to untrusted networks. The source bundle does not identify broader affected product families.
Exploitation context
The sources describe attacker-triggered reboot through a specially crafted HTTP request. CISA KEV is false in the provided bundle, and no cited source states active exploitation.
Researcher notes
The affected CPE data in the bundle is incomplete, but the CVE description names Reolink RLC-410W v3.0.0.136_20121102. Sources do not provide a patch version, active exploitation evidence, or broader model coverage.
Mitigation direction
- Check Reolink guidance and firmware updates; no patched version is named in the provided sources.
- Remove direct internet access to camera management interfaces.
- Restrict camera HTTP access to trusted administration networks or VPNs.
- Monitor for unexpected camera reboots and availability gaps.
- Prioritize replacement or isolation if vendor remediation is unavailable.
Validation and detection
- Inventory Reolink RLC-410W cameras and record firmware versions.
- Identify devices running v3.0.0.136_20121102.
- Confirm management HTTP or cgiserver.cgi is not reachable from untrusted networks.
- Review uptime, system logs, and monitoring for unexplained reboot patterns.
- Track CVE and Talos references for updated vendor remediation details.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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Open ATT&CK lookupCVE-2021-44415 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.6 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H3.94Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
8.6HighVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1421CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.