Security readout for executives and security teams
Plain-English summary
This flaw can let an unauthenticated network attacker reboot an affected Reolink RLC-410W camera by sending a crafted HTTP request. The business impact is availability loss: cameras may go offline or repeatedly restart, affecting monitoring and physical security coverage. The sources do not indicate data theft or camera takeover.
Executive priority
Prioritize remediation where affected cameras support perimeter, safety, or business-critical surveillance, or where their HTTP interface is exposed beyond trusted networks. The impact is operational disruption rather than confirmed confidentiality loss.
Technical view
CVE-2021-44355 covers multiple denial of service issues in the cgiserver.cgi JSON command parser of Reolink RLC-410W firmware v3.0.0.136_20121102. The CVSS 3.0 score is 8.6, with network access, low complexity, no privileges, no user interaction, changed scope, and high availability impact.
Likely exposure
Exposure is limited to Reolink RLC-410W devices running v3.0.0.136_20121102, especially where the camera HTTP interface is reachable from untrusted networks. The provided sources do not identify other Reolink models or firmware versions as affected.
Exploitation context
The sources state that an attacker can send a specially crafted HTTP request to trigger a reboot. The provided data does not list this CVE as KEV and does not provide evidence of active exploitation. Treat internet-reachable devices as higher risk because exploitation requires no credentials.
Researcher notes
The evidence is specific but narrow: affected product, firmware, parser component, HTTP trigger, reboot outcome, CWE-20, and CVSS vector are documented. The supplied sources do not name a fixed version, broader affected range, or confirmed in-the-wild exploitation.
Mitigation direction
- Identify Reolink RLC-410W cameras and confirm firmware versions.
- Check Reolink and Talos guidance for vendor-approved updates or mitigations.
- Remove camera HTTP interfaces from direct internet exposure.
- Restrict access using VPNs, firewalls, or management VLANs.
- Monitor affected cameras for unexpected reboots or availability loss.
Validation and detection
- Inventory camera model and firmware against v3.0.0.136_20121102.
- Confirm whether the HTTP management interface is reachable from untrusted networks.
- Review uptime, device logs, and monitoring for unexplained reboot patterns.
- Verify firewall rules block unauthenticated external access to camera management.
- Track vendor advisories for a documented fixed firmware version.
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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CWE-20: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-44355 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.