Security readout for executives and security teams
Plain-English summary
CVE-2021-44398 is a network-reachable denial-of-service flaw in Reolink RLC-410W firmware v3.0.0.136_20121102. A malformed HTTP request to the camera's CGI JSON parser can force a reboot, interrupting video availability and monitoring operations.
Executive priority
Prioritize exposed or business-critical camera deployments because exploitation can disrupt surveillance availability without authentication. Treat this as an operational resilience issue, not a data-theft issue, based on the supplied evidence.
Technical view
The flaw is improper input validation in cgiserver.cgi's JSON command parser. The source notes an invalid rtmp=stop parameter type can trigger a reboot. CVSS 3.0 is 8.6: network exploitable, low complexity, no privileges, no user interaction, high availability impact.
Likely exposure
Exposure is most relevant where affected Reolink RLC-410W cameras are reachable over a network, especially if administrative CGI endpoints are accessible from untrusted networks or the internet.
Exploitation context
The source states an attacker can send an HTTP request to trigger the issue. The CVE is not marked KEV, and the bundle provides no evidence of active exploitation or public weaponization.
Researcher notes
CWE-20 applies. The root issue is parser handling of malformed JSON command input, specifically a parameter type mismatch noted by Talos. The bundle does not name a patch version, so remediation guidance should stay tied to vendor advisories.
Mitigation direction
- Check Reolink and Talos guidance for firmware updates or vendor-approved mitigations.
- Remove camera management interfaces from direct internet exposure.
- Restrict CGI/admin access to trusted management networks only.
- Place cameras on segmented networks with firewall controls.
- Monitor affected cameras for unexpected reboot or availability loss.
Validation and detection
- Inventory Reolink RLC-410W devices and record firmware versions.
- Identify whether v3.0.0.136_20121102 is deployed.
- Confirm cgiserver.cgi/admin interfaces are not reachable from untrusted networks.
- Review logs or monitoring for unexplained camera reboots.
- Track vendor advisories for confirmed remediation status.
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-2021-44398 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.