Security readout for executives and security teams
Plain-English summary
This vulnerability can let an unauthenticated network attacker crash and reboot an affected Reolink camera by sending a malformed HTTP request. The business impact is availability: camera outages, monitoring gaps, and potential repeated disruption if exposed management interfaces are reachable.
Executive priority
Prioritize exposed security cameras because the impact is monitoring availability, not data theft. If affected devices are internet-reachable or protect critical areas, reduce exposure immediately while checking vendor guidance for remediation.
Technical view
CVE-2021-44401 is a CWE-20 input validation flaw in Reolink RLC-410W firmware v3.0.0.136_20121102. The cgiserver.cgi JSON command parser mishandles a malformed PtzCtrl parameter, causing a denial of service reboot. CVSS 3.0 is 8.6 with network, low-complexity, no-privilege, no-user-interaction characteristics.
Likely exposure
Confirmed exposure is Reolink RLC-410W cameras running firmware v3.0.0.136_20121102. Internet- or broadly LAN-reachable HTTP management paths increase risk. The source bundle’s structured affected-product metadata is incomplete, so do not extrapolate to other models without vendor or Talos confirmation.
Exploitation context
The source bundle says an attacker can send an HTTP request to trigger the reboot condition. CISA KEV is false, and no provided source states active exploitation. Treat this as a plausible denial-of-service risk where affected cameras are reachable.
Researcher notes
Available evidence is narrow: Talos describes the parser flaw, trigger class, affected firmware, and reboot result. The CVE record’s affected-product fields are not populated beyond the narrative description. No patch, workaround, or active exploitation evidence is provided in the bundle.
Mitigation direction
- Inventory Reolink RLC-410W cameras and confirm firmware versions.
- Remove camera HTTP management interfaces from internet exposure.
- Restrict management access to trusted networks or VPN users.
- Check Reolink or Talos guidance for fixed firmware information.
- Monitor affected cameras for unexpected reboot patterns.
Validation and detection
- Identify any RLC-410W devices running v3.0.0.136_20121102.
- Review firewall and access-control paths to camera management interfaces.
- Check logs or monitoring for unexplained camera reboots.
- Confirm compensating controls block untrusted HTTP access.
- Document unsupported or unverified Reolink models separately.
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-2021-44401 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.