Security readout for executives and security teams
Plain-English summary
This CVE can let a remote attacker reboot a vulnerable Reolink RLC-410W camera by sending a malformed HTTP request. The impact is availability loss, not data theft or takeover based on the provided sources. Repeated crashes could disrupt surveillance coverage and operations that depend on the camera feed.
Executive priority
Treat this as a high-priority availability risk for exposed surveillance assets. It does not indicate compromise of confidentiality or integrity, but disruption to physical security monitoring may be operationally significant.
Technical view
CVE-2021-44391 is a CWE-20 input validation flaw in the cgiserver.cgi JSON command parser on Reolink RLC-410W firmware v3.0.0.136_20121102. Sources identify a malformed GetEnc parameter as causing a reboot. CVSS rates it 8.6 because it is network reachable, low complexity, unauthenticated, and impacts availability.
Likely exposure
Exposure is likely limited to Reolink RLC-410W devices running firmware v3.0.0.136_20121102, especially where the HTTP management interface is reachable from untrusted networks or the internet.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation evidence. Public sources indicate an attacker can trigger the condition with an HTTP request, but this assessment does not provide exploit steps.
Researcher notes
The affected product metadata is incomplete in the CVE bundle, but the description names Reolink RLC-410W v3.0.0.136_20121102. No fixed version is provided in the supplied sources, so remediation should be validated against vendor guidance.
Mitigation direction
- Check Reolink and Talos guidance for fixed firmware or vendor-recommended remediation.
- Remove camera management interfaces from internet and untrusted network exposure.
- Restrict access to trusted admin networks, VPNs, or management VLANs.
- Monitor affected cameras for unexpected reboot patterns or availability drops.
- Plan replacement or isolation if no vendor fix is available.
Validation and detection
- Inventory Reolink RLC-410W cameras and record firmware versions.
- Flag devices running firmware v3.0.0.136_20121102 for priority review.
- Confirm cgiserver.cgi or HTTP management is not reachable from untrusted networks.
- Review uptime and monitoring data for unexplained reboots.
- Track vendor advisories for confirmed patches or mitigations.
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-2021-44391 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.