Security readout for executives and security teams
Plain-English summary
This flaw can let a remote attacker force a reboot of a specific Reolink camera model through its web CGI interface. The business impact is availability: affected cameras may stop monitoring or recording during disruption. The provided sources do not state data theft or device takeover.
Executive priority
Treat this as a high-priority availability risk for sites relying on the affected camera model for monitoring, safety, or evidence capture. Urgency rises sharply if management interfaces are internet-exposed or reachable from broad internal networks.
Technical view
CVE-2021-44407 is a CWE-20 input validation issue in the cgiserver.cgi JSON command parser of Reolink RLC-410W v3.0.0.136_20121102. A malformed TestEmail parameter that is not an object can trigger denial of service by rebooting the device. CVSS is 8.6, network exploitable, unauthenticated, no user interaction.
Likely exposure
Exposure is likely limited to Reolink RLC-410W devices running firmware v3.0.0.136_20121102 where the camera web interface or cgiserver.cgi is reachable from untrusted networks. The bundled affected-product metadata is incomplete, so confirm model and firmware through asset inventory.
Exploitation context
The bundle does not indicate CISA KEV listing or active exploitation. The CVE description says an attacker can trigger the issue with an HTTP request, but no public exploit status is established by the provided sources.
Researcher notes
The primary evidence identifies one model and firmware version, but the structured affected fields are n/a. Focus research on firmware confirmation, parser behavior around TestEmail, reboot observability, and whether later Reolink firmware addresses the flaw. Do not assume broader product impact without vendor evidence.
Mitigation direction
- Identify any Reolink RLC-410W devices running firmware v3.0.0.136_20121102.
- Restrict camera management interfaces to trusted administrative networks only.
- Check Reolink and Talos guidance for vendor-confirmed firmware updates or workarounds.
- Monitor affected cameras for unexpected reboots and loss of recording continuity.
- Prioritize replacement or isolation if no vendor fix is available.
Validation and detection
- Inventory camera model, firmware version, and network exposure.
- Confirm whether cgiserver.cgi is reachable from untrusted segments.
- Review device logs or monitoring for unexplained reboot events.
- Check firewall, VPN, and access-control rules protecting camera management access.
- Use only authorized lab validation; avoid production disruption testing.
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-2021-44407 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.