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 interruption: cameras may be unavailable during incidents or monitoring windows. The provided sources do not show data theft or device takeover.
Executive priority
Prioritize if these cameras protect safety, physical security, or regulated facilities. The issue is availability-focused, but camera outages during an incident can create business and operational risk. Internet-exposed devices should be addressed first.
Technical view
CVE-2021-44399 is a CWE-20 input validation flaw in the cgiserver.cgi JSON command parser. Sources describe Reolink RLC-410W v3.0.0.136_20121102, where an invalid GetPtzPreset parameter can trigger a device reboot. CVSS is 8.6 because the attack is network reachable, unauthenticated, low complexity, and availability-impacting.
Likely exposure
Exposure appears limited to Reolink RLC-410W devices running firmware v3.0.0.136_20121102, based on the source description. Broader affected versions or products are not established in the provided evidence. Internet-facing camera management endpoints would materially increase risk.
Exploitation context
The sources say an attacker can send an HTTP request to trigger the reboot. CISA KEV is false in the bundle, and no provided source confirms active exploitation. Treat exploitation status as unconfirmed, not absent.
Researcher notes
The provided evidence is narrow: one named model and firmware, unauthenticated network reachability, and reboot impact. No patch details, exploit-in-the-wild confirmation, or expanded affected-version list are included. Avoid assuming other Reolink models are affected without vendor evidence.
Mitigation direction
- Check Reolink and Talos guidance for corrected firmware or vendor-recommended mitigation.
- Remove camera management interfaces from direct Internet exposure.
- Restrict HTTP access to trusted administration networks or VPN paths.
- Monitor vulnerable cameras for unexplained reboots or availability loss.
- Prioritize replacement or isolation where no vendor fix is available.
Validation and detection
- Inventory Reolink RLC-410W devices and record firmware versions.
- Identify any devices running v3.0.0.136_20121102.
- Confirm camera HTTP management endpoints are not publicly reachable.
- Review monitoring and logs for repeated unexpected reboots.
- Track vendor advisories for patch availability or clarified affected versions.
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-2021-44399 mapping review
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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.