Security readout for executives and security teams
Plain-English summary
CVE-2021-44381 can let an unauthenticated remote attacker crash and reboot a specific Reolink camera by sending a malformed HTTP request. The business impact is loss of camera availability, not data theft. The provided sources do not show active exploitation or a confirmed vendor fix.
Executive priority
Treat as a high-priority availability risk where these cameras support security monitoring, safety, or operations. Urgency is lower where devices are isolated and not mission-critical, but exposure should still be reduced promptly.
Technical view
Talos reports improper input validation in the cgiserver.cgi JSON command parser of Reolink RLC-410W v3.0.0.136_20121102. A malformed SetPowerLed parameter can trigger a reboot. CVSS 8.6 reflects network reachability, low complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Highest exposure is Reolink RLC-410W cameras running v3.0.0.136_20121102 with the HTTP management/API interface reachable by untrusted networks. The source bundle does not establish impact for other Reolink models or firmware versions.
Exploitation context
The public Talos advisory describes a specially crafted HTTP request causing denial of service. The bundle marks KEV as false and provides no cited evidence of active exploitation in the wild.
Researcher notes
The core issue is CWE-20 input validation in JSON command parsing. Evidence specifically mentions SetPowerLed not being an object and cgiserver.cgi reboot behavior. Avoid assuming broader product impact, patch availability, or exploitation beyond the cited sources.
Mitigation direction
- Check Reolink and Talos guidance for fixed firmware or vendor workarounds.
- Remove affected camera management interfaces from direct internet exposure.
- Restrict cgiserver.cgi access to trusted admin networks or VPN paths.
- Prioritize replacement if affected firmware has no supported update.
- Monitor affected devices for unexpected reboot patterns.
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 device uptime and logs for unexplained reboot events.
- Track vendor advisories for firmware status before closure.
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-2021-44381 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.