Security readout for executives and security teams
Plain-English summary
This vulnerability can let an authenticated network attacker force a vulnerable Reolink RLC-410W camera to reboot. The business impact is availability: security cameras may become unreliable or temporarily unavailable. The supplied sources identify one affected firmware version, but do not name a vendor patch or confirmed active exploitation.
Executive priority
Prioritize this where vulnerable cameras support security, safety, or compliance monitoring. The issue is not described as data theft, but repeated reboots can reduce visibility during incidents. Focus first on asset discovery, network isolation, and vendor update checks.
Technical view
CVE-2021-40405 is a denial-of-service flaw in the Reolink RLC-410W cgiserver.cgi Upgrade API on firmware v3.0.0.136_20121102. CVSS 3.0 is 7.7 high, with network access, low complexity, low privileges, no user interaction, and high availability impact. The weakness is mapped to CWE-284.
Likely exposure
Exposure is likely limited to Reolink RLC-410W cameras running v3.0.0.136_20121102 where an attacker has network reachability and valid low-privilege access. Risk increases if camera management interfaces are reachable from untrusted networks or shared user accounts are broadly available.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. The CVE and Talos description state that an attacker can send an HTTP request to trigger a reboot, but no exploit status beyond that is provided.
Researcher notes
The public data identifies the affected model, firmware, API area, CVSS vector, and availability impact. Patch status, broader firmware impact, and real-world exploitation are not established in the supplied sources. Do not generalize to other Reolink models without vendor evidence.
Mitigation direction
- Inventory Reolink RLC-410W cameras and identify firmware v3.0.0.136_20121102.
- Check Reolink and Talos guidance for firmware updates or vendor mitigations.
- Restrict camera management interfaces to trusted admin networks only.
- Remove unnecessary user accounts and enforce least-privilege camera access.
- Monitor vulnerable cameras for unexpected reboot patterns.
Validation and detection
- Confirm model and firmware version from asset records or camera administration interfaces.
- Verify camera management endpoints are not internet-exposed.
- Review access controls for accounts permitted to use camera administration functions.
- Check monitoring logs for unexplained reboot events affecting surveillance coverage.
- Use only non-disruptive validation; do not send crafted reboot-triggering requests.
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-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2021-40405 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
- 7.7 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:L/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:L/UI:N/S:C/C:N/I:N/A:H3.14Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.7HighVector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1422CVE 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 Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.