Security readout for executives and security teams
Plain-English summary
CVE-2021-40425 is a Webroot Secure Anywhere 21.4 driver flaw that can crash or disrupt protected endpoints. It is local, not remotely internet-facing, but it affects availability of systems running the vulnerable security product.
Executive priority
Treat this as a high-priority endpoint resilience issue, especially where Webroot protects critical systems. It is not shown as actively exploited, but a local attacker or malware could disrupt security coverage or endpoint availability.
Technical view
The issue is a CWE-125 out-of-bounds read in IOCTL handling for GetProcessCommand and B_03 in the WRCore_x64 driver. A specially crafted local executable can issue an IOCTL and trigger denial of service. CVSS is 7.1, high.
Likely exposure
Exposure is most likely on Windows endpoints running Webroot Secure Anywhere 21.4 with the WRCore_x64 driver. Because attack vector is local, risk depends on whether untrusted code can run on those endpoints.
Exploitation context
The sources describe local IOCTL-triggered denial of service. The bundle does not include KEV status or cited evidence of active exploitation, so active exploitation should not be assumed.
Researcher notes
Evidence is strongest for Webroot Secure Anywhere 21.4 and DoS impact through WRCore_x64 IOCTL handling. The bundle does not name a fixed version, patch date, or broader affected version range.
Mitigation direction
- Inventory Webroot Secure Anywhere deployments and identify version 21.4 installations.
- Check Webroot vendor guidance for fixed builds or supported mitigation instructions.
- Prioritize remediation on shared workstations, servers, and high-availability endpoints.
- Limit execution of untrusted local programs on affected endpoints.
- Monitor endpoint crashes or security-agent instability until remediation is complete.
Validation and detection
- Confirm installed Webroot Secure Anywhere versions through approved asset inventory.
- Verify whether affected hosts load the WRCore_x64 driver.
- Review vendor and Talos advisories for affected-version and remediation details.
- Check endpoint telemetry for repeated Webroot driver crashes or denial-of-service symptoms.
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-125: 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-2021-40425 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
- 7.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:L/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:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H2.54Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.1HighVector: CVSS:3.0/AV:L/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-2021-1433CVE 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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.