Security readout for executives and security teams
Plain-English summary
This flaw can let a remote attacker crash and reboot a specific Reolink camera by sending malformed web traffic. The business impact is availability: surveillance gaps, operational disruption, and repeated device instability if camera management interfaces are reachable from untrusted networks.
Executive priority
Treat as high priority where affected cameras support physical security, safety monitoring, or remote operations. The issue does not indicate data theft, but repeated reboot capability can create surveillance blind spots and operational risk.
Technical view
CVE-2021-44376 is a CWE-20 input validation issue in the cgiserver.cgi JSON command parser on Reolink RLC-410W v3.0.0.136_20121102. The cited condition involves SetIsp not being an object, causing denial of service via reboot. CVSS is 8.6 high.
Likely exposure
Likely exposure is Reolink RLC-410W cameras running firmware v3.0.0.136_20121102 with the web management interface reachable over a network. The structured affected-product metadata is incomplete, so exposure should not be generalized beyond the cited model and firmware.
Exploitation context
The bundle does not indicate CISA KEV listing or active exploitation. Sources state an attacker can send a specially crafted HTTP request to trigger reboot, but no public source here confirms exploitation in the wild.
Researcher notes
The key evidence points to parser type validation failure in cgiserver.cgi, specifically SetIsp parameter handling. The source bundle lacks a fixed version, vendor advisory details, and a complete affected-product matrix, so conclusions should remain limited to the cited device and firmware.
Mitigation direction
- Inventory Reolink RLC-410W cameras and record firmware versions.
- Check Reolink guidance for firmware updates or official mitigations.
- Block camera management interfaces from internet and guest networks.
- Place cameras on a restricted management or IoT VLAN.
- Monitor affected cameras for unexpected reboot patterns.
Validation and detection
- Confirm whether any device matches RLC-410W v3.0.0.136_20121102.
- Verify cgiserver.cgi is not reachable from untrusted networks.
- Review firewall rules for camera management access paths.
- Check uptime and logs for unexplained reboot events.
- Document any vendor-fixed firmware identified during review.
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-2021-44376 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.