Security readout for executives and security teams
Plain-English summary
This vulnerability can let a remote attacker crash and reboot a specific Reolink camera by sending a malformed web request. The main business impact is loss of camera availability, not data theft. Internet-exposed or broadly reachable camera management interfaces create the highest operational risk.
Executive priority
Prioritize remediation where cameras support physical security, compliance monitoring, or incident response. A reboot-only flaw can still create meaningful blind spots if attackers can repeatedly disrupt coverage. Isolate exposed devices immediately while confirming vendor update status.
Technical view
CVE-2021-44387 is improper input validation in the cgiserver.cgi JSON command parser of Reolink RLC-410W v3.0.0.136_20121102. Sources state a specially crafted HTTP request where SetPtzPreset is not an object can trigger a reboot. CVSS 8.6 reflects network reachability, no required authentication, and high availability impact.
Likely exposure
Exposure appears limited to Reolink RLC-410W devices running firmware v3.0.0.136_20121102, based on the provided description. The CVE affected-product metadata is incomplete, listing n/a fields, so asset teams should verify model and firmware directly rather than infer broader Reolink impact.
Exploitation context
The sources describe remote triggering by HTTP request, but the bundle does not cite active exploitation and KEV is false. Public technical details exist through Talos, so defensive teams should treat reachable devices as plausibly discoverable without claiming known in-the-wild exploitation.
Researcher notes
Evidence is strongest for the named Reolink RLC-410W firmware build. The CVE metadata has incomplete affected CPE/product fields, so do not generalize beyond cited evidence. Analysis should focus on unauthenticated network exposure, parser input validation, and operational availability impact.
Mitigation direction
- Identify Reolink RLC-410W devices and record exact firmware versions.
- Check Reolink and Talos guidance for fixed firmware or vendor mitigation.
- Remove camera management and CGI endpoints from internet exposure.
- Restrict access to trusted admin networks or VPN paths only.
- Monitor affected cameras for unexpected reboots or availability gaps.
Validation and detection
- Compare device firmware against v3.0.0.136_20121102.
- Confirm cgiserver.cgi is not reachable from untrusted networks.
- Review web access logs for suspicious requests before reboots.
- Check uptime and monitoring data for unexplained camera resets.
- Avoid malformed-request testing on production cameras.
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-2021-44387 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.