Security readout for executives and security teams
Plain-English summary
This issue can let an unauthenticated network attacker make a listed Reolink RLC-410W camera reboot by sending a malformed HTTP request to its CGI server. The business impact is loss of camera availability, not data theft. The source bundle does not show active exploitation or a named patch.
Executive priority
Prioritize remediation for exposed or security-critical camera deployments. The issue affects availability and can blind monitoring coverage, but current supplied evidence does not show data compromise or confirmed active exploitation.
Technical view
CVE-2021-44390 is an input-validation flaw in cgiserver.cgi JSON command parsing on Reolink RLC-410W v3.0.0.136_20121102. The described failure case is a non-object format parameter, causing a reboot. CVSS 3.0 is 8.6: network reachable, low complexity, no privileges, no user interaction, high availability impact.
Likely exposure
Exposure is most likely where the affected Reolink RLC-410W firmware’s HTTP management interface is reachable from untrusted networks. The bundle does not identify other products, versions, CPEs, or deployment prevalence.
Exploitation context
The CVE states an attacker can trigger the reboot with an HTTP request. CISA KEV is false in the bundle, and no provided source states active exploitation. Treat exploit status as unconfirmed.
Researcher notes
The affected metadata is incomplete in the bundle, with vendor and product listed as n/a while the description names Reolink RLC-410W v3.0.0.136_20121102. Fix status is not provided. Avoid assuming additional affected models or firmware without vendor confirmation.
Mitigation direction
- Check Reolink and Talos guidance for firmware updates or vendor-specific mitigations.
- Remove camera management interfaces from internet exposure.
- Restrict access to trusted administrative networks or VPN paths.
- Segment cameras from business-critical systems and untrusted user networks.
- Monitor affected devices for unexpected reboots or availability drops.
Validation and detection
- Inventory Reolink RLC-410W devices and record firmware versions.
- Confirm whether v3.0.0.136_20121102 is present.
- Review firewall and routing rules for exposed camera HTTP management access.
- Check device uptime, logs, or monitoring for unexplained reboots.
- Document any vendor advisory, firmware, or mitigation status found.
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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Open ATT&CK lookupCVE-2021-44390 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.