Security readout for executives and security teams
Plain-English summary
CVE-2021-44413 can let an unauthenticated network attacker force an affected Reolink camera to reboot. The business impact is availability loss: cameras may drop offline during monitoring or incident response. The provided sources do not show data theft or device takeover.
Executive priority
Treat this as a high-priority availability risk for affected camera deployments, not as confirmed ransomware-grade exposure. Internet-exposed or safety-critical cameras should be isolated or updated first because exploitation requires no authentication according to the CVE.
Technical view
The issue is improper input validation in the cgiserver.cgi JSON command parser of Reolink RLC-410W v3.0.0.136_20121102. A malformed HTTP request involving the AddUser parameter can trigger a denial of service reboot. CVSS 8.6 reflects network reachability, no authentication, and high availability impact.
Likely exposure
Exposure is most relevant for organizations using Reolink RLC-410W cameras on the affected firmware, especially where camera management endpoints are reachable from untrusted networks. The source bundle does not identify broader affected models or versions.
Exploitation context
The CVE states an attacker can send an HTTP request to trigger the reboot. CISA KEV status is false in the bundle, and no cited source here confirms active exploitation in the wild.
Researcher notes
Evidence is strongest for one firmware build and one model named in the CVE description. The bundle does not provide patch version details, proof of active exploitation, or confirmation that other Reolink models are affected.
Mitigation direction
- Check Reolink guidance for fixed firmware or vendor-recommended mitigation.
- Restrict camera management access to trusted administrative networks only.
- Remove affected cameras from direct internet exposure.
- Monitor camera uptime and alerts for unexpected reboot patterns.
- Prioritize replacement or isolation if no vendor fix is available.
Validation and detection
- Inventory Reolink RLC-410W devices and record firmware versions.
- Confirm whether any device runs v3.0.0.136_20121102.
- Review firewall and router rules for exposed camera management access.
- Check monitoring logs for unexplained camera reboots.
- Document compensating controls where firmware cannot be updated.
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-2021-44413 mapping review
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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.