Security readout for executives and security teams
Plain-English summary
This CVE affects a Reolink RLC-410W camera firmware build where logged-in users may be allowed to run GET APIs they should not control. Business risk is strongest where camera management interfaces are reachable by broad user populations or exposed networks. The provided sources do not show active exploitation or name a fixed version.
Executive priority
Prioritize remediation when affected cameras are reachable from user networks, remote access zones, or the internet. If cameras are isolated with tightly controlled administrator access, urgency is lower but still warrants firmware and access review.
Technical view
CVE-2021-40416 is a CWE-284 incorrect default permission issue in cgiserver.cgi cgi_check_ability on Reolink RLC-410W v3.0.0.136_20121102. APIs not covered by cgi_check_ability are executable by any authenticated user. CVSS 3.0 is 7.1: network reachable, low complexity, low privileges, no user interaction, high availability impact.
Likely exposure
Exposure is likely limited to environments running the named Reolink RLC-410W firmware with reachable camera CGI management services and non-admin authenticated users. The structured affected-product data is incomplete, so do not assume other models or versions without vendor evidence.
Exploitation context
The source bundle supports authenticated network exploitation by HTTP request, but not unauthenticated exploitation. CISA KEV status is false, and no provided source states active exploitation in the wild. The main stated impact is availability, with limited integrity impact and no stated confidentiality impact.
Researcher notes
The CVE affected-product fields are not populated, but the description names Reolink RLC-410W v3.0.0.136_20121102. The bundle does not provide patch details. Keep validation scoped to permission boundaries and avoid assuming broader Reolink exposure.
Mitigation direction
- Check Reolink and Talos guidance for fixed firmware or vendor-approved mitigation.
- Restrict camera management access to trusted admin networks or VPN-only paths.
- Remove unnecessary camera user accounts and avoid shared low-privilege logins.
- Block direct internet exposure of affected camera CGI services.
- Monitor for unusual authenticated requests to camera CGI endpoints.
Validation and detection
- Inventory Reolink RLC-410W cameras and record firmware versions.
- Confirm whether v3.0.0.136_20121102 exists in the environment.
- Review network paths to camera management and CGI interfaces.
- Verify which users can authenticate to affected camera services.
- In authorized testing, assess whether low-privilege users can access unintended GET APIs.
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-284: Authorization and privilege behavior lookup
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Open ATT&CK lookupCVE-2021-40416 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
- 7.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/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:L/UI:N/S:U/C:N/I:L/A:H2.84.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.1HighVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1425CVE 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 Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.