Security readout for executives and security teams
Plain-English summary
CVE-2021-44402 can let an unauthenticated network attacker crash and reboot a vulnerable Reolink camera with a crafted HTTP request. The business impact is loss of camera availability, which matters most where cameras support physical security, monitoring, or incident response.
Executive priority
Treat this as high priority for exposed or operationally important cameras. It is not a data-theft issue in the provided evidence, but forced reboots can blind monitoring coverage and weaken physical security reliability.
Technical view
The flaw is improper input validation in the cgiserver.cgi JSON command parser for Reolink RLC-410W v3.0.0.136_20121102. The source description identifies the GetPtzSerial parameter being supplied in an unexpected type, causing a reboot. CVSS is 8.6 with network attack vector, low complexity, no privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most likely where Reolink RLC-410W cameras on the cited firmware expose their HTTP CGI interface to untrusted networks. The structured affected-product metadata is incomplete, so validate against device model, firmware, and vendor advisory data.
Exploitation context
The provided bundle does not show CISA KEV listing or active exploitation evidence. Talos reported that an attacker can send an HTTP request to trigger the reboot, but this analysis does not provide exploit steps or payload details.
Researcher notes
CWE-20 aligns with the described parser type-validation failure. The CVE record’s structured affected list is not populated, while the description names Reolink RLC-410W v3.0.0.136_20121102. No patch, workaround, or active exploitation claim is included in the supplied evidence.
Mitigation direction
- Check Reolink and Talos guidance for fixed firmware or vendor-recommended workarounds.
- Remove camera HTTP management interfaces from public internet exposure.
- Restrict access to trusted admin networks or VPN paths only.
- Segment security cameras from general user and guest networks.
- Prioritize remediation where camera downtime affects physical security operations.
Validation and detection
- Inventory Reolink RLC-410W devices and record firmware versions.
- Identify any devices running v3.0.0.136_20121102.
- Confirm whether cgiserver.cgi or camera HTTP management is reachable from untrusted networks.
- Review monitoring for unexpected camera reboots or availability drops.
- Track vendor advisory status because source metadata does not name a patch.
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
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Open ATT&CK lookupCVE-2021-44402 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.