Security readout for executives and security teams
Plain-English summary
This CVE can let an unauthenticated network attacker force a vulnerable Reolink RLC-410W camera to reboot by sending a malformed HTTP request to its CGI interface. The business impact is availability: cameras may be knocked offline, interrupting monitoring or incident review. Sources do not state data theft, integrity impact, a vendor fix, or active exploitation.
Executive priority
Prioritize remediation where affected cameras support security operations, regulated monitoring, or safety workflows. The issue is not described as data compromise, but repeated reboots can create surveillance gaps. Act quickly for exposed devices; otherwise handle through firmware governance and network segmentation.
Technical view
The issue is CWE-20 improper input validation in the cgiserver.cgi JSON command parser. On Reolink RLC-410W firmware v3.0.0.136_20121102, a malformed Preview parameter that is not an object can trigger denial of service/reboot. CVSS 3.0 is 8.6: network, low complexity, unauthenticated, no user interaction, changed scope, high availability impact.
Likely exposure
Exposure is likely limited to Reolink RLC-410W cameras running firmware v3.0.0.136_20121102 with the HTTP CGI interface reachable from untrusted networks. Internet-facing cameras, flat internal networks, and camera management interfaces reachable from guest or contractor networks raise urgency.
Exploitation context
The source bundle says an attacker can send an HTTP request to trigger reboot. CISA KEV status is false, and the provided sources do not report active exploitation. Treat this as a practical availability risk because exploitation requires no authentication and low complexity, but do not assume observed attacks without local evidence.
Researcher notes
Evidence identifies one firmware build and one affected camera model. The public bundle does not provide a patch version, official mitigation, or exploitation telemetry. Validation should focus on asset identification, reachable management surfaces, and operational reboot evidence rather than reproducing the malformed request.
Mitigation direction
- Check Reolink guidance for fixed firmware or official workarounds.
- Remove camera management interfaces from internet exposure.
- Restrict HTTP access to trusted management networks only.
- Place affected cameras behind firewall or VPN controls.
- Monitor vulnerable cameras for unexpected reboot patterns.
Validation and detection
- Inventory Reolink RLC-410W cameras and record firmware versions.
- Identify any device running v3.0.0.136_20121102.
- Confirm whether cgiserver.cgi is reachable from untrusted networks.
- Review logs or uptime data for unexplained camera reboots.
- Track vendor advisories for patch availability or mitigation updates.
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
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-44396 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.