Security readout for executives and security teams
Plain-English summary
This vulnerability affects a specific Reolink RLC-410W camera firmware version and can let an unauthenticated network attacker force the device to reboot. The business impact is availability: camera outages, monitoring gaps, and repeated disruption if exposed to untrusted networks.
Executive priority
Treat this as a high-priority availability risk for physical security operations, not a data-theft issue. Prioritize internet-exposed or mission-critical cameras first, then isolate or update affected devices based on vendor guidance.
Technical view
CVE-2021-44356 is a CWE-20 input validation flaw in the cgiserver.cgi JSON command parser of Reolink RLC-410W v3.0.0.136_20121102. The CVSS 8.6 vector indicates network access, low complexity, no privileges, no user interaction, changed scope, and high availability impact only.
Likely exposure
Exposure is limited to Reolink RLC-410W devices running v3.0.0.136_20121102, especially where the camera HTTP management surface is reachable from the internet, guest networks, or other untrusted segments.
Exploitation context
The provided sources describe denial of service via a specially crafted HTTP request causing reboot. CISA KEV status is false in the bundle, and no provided source confirms active exploitation in the wild.
Researcher notes
The source bundle names one affected firmware and one vulnerability class. It does not provide patch status, vulnerable parameter details, or confirmed exploitation. Validation should remain non-destructive and focus on inventory, reachability, and operational evidence.
Mitigation direction
- Inventory Reolink RLC-410W devices and record firmware versions.
- Check Reolink and Talos guidance for fixed firmware or vendor mitigations.
- Restrict camera HTTP access to trusted management networks or VPN only.
- Block direct internet exposure for affected camera management interfaces.
- Monitor affected sites for unexpected camera reboots or availability gaps.
Validation and detection
- Confirm whether any RLC-410W device runs v3.0.0.136_20121102.
- Verify management interfaces are not reachable from untrusted networks.
- Review device uptime and monitoring records for repeated unexplained reboots.
- Check firewall and access-control rules around camera HTTP services.
- Track vendor advisories for patch availability or replacement 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-2021-44356 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.