Security readout for executives and security teams
Plain-English summary
This vulnerability can let an unauthenticated remote attacker crash and reboot an affected Reolink RLC-410W device by sending a malformed HTTP request. The business impact is availability loss for any exposed device, which may matter if the device supports monitoring, safety, or site operations.
Executive priority
Treat this as high priority for exposed devices because exploitation requires only network access and can disrupt availability. Prioritize internet-facing or operationally important deployments first. If the device is isolated and not business-critical, urgency is lower but still requires tracking.
Technical view
CVE-2021-44405 is an input validation flaw in the cgiserver.cgi JSON command parser on Reolink RLC-410W v3.0.0.136_20121102. The cited description says the StartZoomFocus parameter is improperly parsed when it is not an object, causing a reboot. CVSS 3.0 is 8.6, network exploitable, no privileges or user interaction required.
Likely exposure
Exposure is most likely where Reolink RLC-410W devices running v3.0.0.136_20121102 have HTTP access reachable from untrusted networks. Internet-exposed management interfaces create the clearest risk. The source bundle does not identify broader affected products or firmware versions.
Exploitation context
The bundle states an attacker can send a specially crafted HTTP request to trigger a reboot. It does not cite public exploitation, and CISA KEV status is false, so there is no source-backed evidence here of active exploitation.
Researcher notes
The provided affected metadata is incomplete, but the description specifically names Reolink RLC-410W v3.0.0.136_20121102. Root cause is CWE-20 input validation in JSON command parsing. Avoid assuming other Reolink models or versions are affected without vendor or Talos confirmation.
Mitigation direction
- Check Reolink and Talos guidance for fixed firmware or vendor workarounds.
- Remove affected device HTTP interfaces from direct internet exposure.
- Limit management access to trusted networks or VPN-only paths.
- Segment affected devices from critical business systems.
- Plan firmware update or replacement if vendor support is unavailable.
Validation and detection
- Inventory Reolink RLC-410W devices and record firmware versions.
- Identify whether cgiserver.cgi or device HTTP management is network-reachable.
- Review firewall, NAT, and remote access rules for public exposure.
- Check logs or monitoring for unexpected device reboots.
- Confirm remediation status against vendor or Talos guidance.
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
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CWE-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-44405 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.