Security readout for executives and security teams
Plain-English summary
This vulnerability can let a remote attacker force an affected Reolink RLC-410W camera to reboot by sending a specially crafted HTTP request. The business risk is service disruption for camera monitoring, not data theft. The source bundle names one affected firmware version and does not provide a vendor fix version.
Executive priority
Treat this as a high-priority availability issue for camera fleets, especially where affected devices support physical security monitoring. Prioritize internet exposure reduction and firmware verification while seeking vendor guidance for a supported fix.
Technical view
CVE-2021-44366 is a CWE-20 input validation issue in the cgiserver.cgi JSON command parser on Reolink RLC-410W v3.0.0.136_20121102. CVSS 3.0 is 8.6: network reachable, low complexity, no privileges, no user interaction, with high availability impact and no confidentiality or integrity impact.
Likely exposure
Exposure is most likely where Reolink RLC-410W cameras running v3.0.0.136_20121102 have HTTP management interfaces reachable from untrusted networks. Internet-facing cameras, flat internal networks, and remotely administered camera deployments increase operational risk.
Exploitation context
The bundled sources say an attacker can send an HTTP request to trigger a reboot. CISA KEV is false, and the provided sources do not state active exploitation in the wild or provide evidence of public exploitation activity.
Researcher notes
Evidence is specific to Reolink RLC-410W v3.0.0.136_20121102 and cgiserver.cgi JSON command parsing. The bundle does not name fixed firmware, compensating controls from Reolink, or exploitation in the wild. Avoid assuming broader Reolink exposure without device and firmware confirmation.
Mitigation direction
- Inventory Reolink RLC-410W devices and record firmware versions.
- Remove camera HTTP interfaces from direct internet exposure.
- Restrict management access with firewall rules, VPN, or trusted admin networks.
- Check Reolink guidance for fixed firmware or official mitigation.
- Segment camera networks from business-critical systems.
- Monitor for unexpected camera reboots and management-interface requests.
Validation and detection
- Confirm whether any RLC-410W camera runs v3.0.0.136_20121102.
- Review external exposure using asset inventory and firewall configuration.
- Check logs or uptime history for unexplained camera reboots.
- Verify management interfaces are limited to trusted networks.
- Track vendor advisories before applying firmware changes.
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
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-44366 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.