Security readout for executives and security teams
Plain-English summary
This CVE can let an unauthenticated network attacker reboot a specific Reolink camera by sending a malformed HTTP request. The business impact is service disruption: surveillance coverage may drop until the device restarts. The sources do not show data theft, device takeover, or active exploitation.
Executive priority
Treat this as a high-priority availability risk for sites that rely on affected cameras for security monitoring. Prioritize externally reachable devices first, then cameras on shared internal networks. If the model or firmware is absent, urgency drops substantially.
Technical view
CVE-2021-44417 is a CWE-20 input validation flaw in the cgiserver.cgi JSON command parser for Reolink RLC-410W v3.0.0.136_20121102. A GetAlarm parameter that is not an object can trigger denial of service through reboot. CVSS 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 their HTTP interface reachable from untrusted networks. Internet-facing cameras and flat IoT networks are higher risk. The bundle does not establish other affected models or versions.
Exploitation context
The CVE is not marked in KEV, and the provided sources do not state active exploitation. The described attack requires network access to the camera HTTP service and can cause reboot-based denial of service. No evidence in the bundle supports confidentiality or integrity compromise.
Researcher notes
The source bundle identifies one tested product and firmware version despite the affected metadata listing n/a. Do not broaden scope without vendor evidence. The vulnerability is input-validation related and availability-focused; remediation details are not named in the provided sources.
Mitigation direction
- Check Reolink and Talos guidance for fixed firmware or vendor mitigations.
- Remove camera HTTP management interfaces from internet exposure.
- Restrict camera access with firewall rules, VPN, or isolated management networks.
- Segment cameras from business-critical systems and user workstations.
- Monitor affected cameras for repeated unexpected reboots or outages.
Validation and detection
- Inventory Reolink RLC-410W devices and record firmware versions.
- Confirm whether v3.0.0.136_20121102 is present in the environment.
- Verify camera HTTP interfaces are not reachable from untrusted networks.
- Review uptime, device logs, and monitoring for unexplained reboot patterns.
- Document compensating controls where firmware fixes are unavailable.
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-2021-44417 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.