Security readout for executives and security teams
Plain-English summary
This flaw lets an unauthenticated network attacker reboot a specific Reolink camera by sending a malformed HTTP request. It does not indicate data theft or settings changes, but it can interrupt video availability. The sources identify Reolink RLC-410W firmware v3.0.0.136_20121102; broader affected scope is not established in the bundle.
Executive priority
Treat as high priority for exposed surveillance environments because the business impact is loss of camera availability. Prioritize internet-facing or broadly reachable cameras first. Internally isolated devices still need firmware and access-control review, but urgency depends on operational reliance and network trust boundaries.
Technical view
CVE-2021-44392 is a CWE-20 input validation issue in cgiserver.cgi JSON command parsing. Talos and CVE describe a denial of service when the GetImage parameter is not an object, causing reboot via HTTP. CVSS 3.0 is 8.6, network-reachable, low complexity, no privileges or user interaction, availability impact only.
Likely exposure
Exposure is most likely where Reolink RLC-410W cameras running v3.0.0.136_20121102 have the HTTP CGI interface reachable from untrusted networks. Internet-exposed camera management interfaces are the highest concern. The source bundle does not confirm other models, firmware branches, or CPE entries.
Exploitation context
The bundle supports remote, unauthenticated denial of service via crafted HTTP request. It does not cite active exploitation, and CISA KEV status is false. No public source in the bundle supports confidentiality, integrity, persistence, or code execution impact.
Researcher notes
Evidence is narrow: the bundle names Reolink RLC-410W v3.0.0.136_20121102 and describes GetImage type confusion in JSON parsing. Do not generalize affected products without vendor confirmation. Testing should avoid disruptive payloads on production cameras because successful validation may reboot the device.
Mitigation direction
- Check Reolink and Talos guidance for fixed firmware or official mitigations.
- Update affected cameras if a vendor-supported firmware fix is available.
- Remove camera management interfaces from internet exposure.
- Restrict HTTP CGI access to trusted management networks only.
- Use firewall or VPN controls for remote administration.
- Monitor affected devices for unexpected reboot patterns.
Validation and detection
- Inventory Reolink RLC-410W devices and firmware versions.
- Identify cameras exposing HTTP management to untrusted networks.
- Review logs or monitoring for unexpected reboots.
- Check for requests targeting cgiserver.cgi or GetImage handling.
- Confirm segmentation blocks unauthenticated access from untrusted sources.
- Track vendor advisory status before closing remediation.
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-2021-44392 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.