Security readout for executives and security teams
Plain-English summary
CVE-2021-44400 can let an unauthenticated network attacker reboot a vulnerable Reolink RLC-410W camera, causing loss of video availability. The source bundle names firmware v3.0.0.136_20121102. This is an availability risk, not a reported data theft issue.
Executive priority
Prioritize exposed cameras because the impact is operational disruption of surveillance. If devices are internal-only and segmented, urgency is lower but still requires firmware and exposure validation.
Technical view
The flaw is improper input validation in the cgiserver.cgi JSON command parser. Sources state a specially crafted HTTP request where the GetPtzPatrol parameter is not an object can trigger a device reboot. CVSS 8.6 reflects network reachability, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely where Reolink RLC-410W camera management interfaces are reachable from the internet, guest networks, or other untrusted segments. The CVE affected-product metadata is incomplete, but the description specifically names RLC-410W v3.0.0.136_20121102.
Exploitation context
The bundle does not cite active exploitation, and KEV is false. Public details identify the vulnerable component and crash condition, so defenders should treat exposed management endpoints as higher risk even without confirmed exploitation evidence.
Researcher notes
Evidence is strongest for Reolink RLC-410W v3.0.0.136_20121102 and availability impact. The CVE record’s affected fields are listed as n/a, and the supplied sources do not name a patch level or confirmed exploitation.
Mitigation direction
- Inventory Reolink RLC-410W cameras and record firmware versions.
- Check Reolink or Talos guidance for fixed firmware or vendor-recommended mitigations.
- Remove camera management interfaces from direct internet exposure.
- Restrict access to trusted admin networks or VPN paths.
- Monitor camera reboot events and management-interface errors.
Validation and detection
- Confirm whether any RLC-410W devices run v3.0.0.136_20121102.
- Review firewall and NAT rules for exposed camera management services.
- Check asset scans for cgiserver.cgi exposure on untrusted networks.
- Correlate unexplained camera reboots with management-interface access logs.
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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Open ATT&CK lookupCVE-2021-44400 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.