Security readout for executives and security teams
Plain-English summary
This vulnerability can let an unauthenticated network attacker reboot an affected Reolink RLC-410W camera by sending malformed input to its CGI JSON parser. The business impact is availability: cameras may become unreliable or unavailable during an incident, outage, or repeated disruption attempt.
Executive priority
Treat this as a high-priority availability risk for sites relying on affected cameras for monitoring, response, or physical security. Prioritize exposure reduction first, then firmware/vendor validation.
Technical view
CVE-2021-44393 is a CWE-20 input validation flaw in cgiserver.cgi JSON command parsing on Reolink RLC-410W v3.0.0.136_20121102. The source states a malformed GetIsp parameter can trigger a reboot. CVSS 3.0 is 8.6, with network attack vector, low complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most relevant where affected Reolink RLC-410W cameras expose the web or CGI management interface to untrusted networks. The CVE affected-product metadata is incomplete, but the description names RLC-410W v3.0.0.136_20121102.
Exploitation context
The provided bundle does not show CISA KEV listing or active exploitation. The CVSS vector indicates remote, unauthenticated triggering is possible, but the documented impact is denial of service through reboot, not confidentiality or integrity compromise.
Researcher notes
The core condition is malformed JSON command input where GetIsp is not an object, causing device reboot. Source evidence supports denial of service only. Affected metadata in the CVE record is sparse, so validation should anchor on the named model and firmware from the description.
Mitigation direction
- Identify affected Reolink RLC-410W cameras and confirm firmware versions.
- Remove camera management interfaces from direct internet exposure.
- Restrict access to trusted management networks or VPN-only administration paths.
- Check Reolink and Talos guidance for firmware updates or vendor mitigations.
- Monitor affected cameras for unexpected reboots or availability drops.
Validation and detection
- Inventory Reolink RLC-410W devices and record firmware versions.
- Confirm whether cgiserver.cgi or web administration is reachable from untrusted networks.
- Review firewall, NAT, and remote-access rules protecting camera management paths.
- Check device uptime and logs for unexplained reboot patterns.
- Document compensating controls where vendor patch status is unclear.
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-2021-44393 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.