Security readout for executives and security teams
Plain-English summary
CVE-2021-31838 lets a logged-in MVISION EDR administrator cause an EDR client to run arbitrary PowerShell commands through the product's execute reaction feature. Business risk is high where older MVISION EDR is deployed, because endpoint compromise can affect confidentiality, integrity, and availability.
Executive priority
Prioritize remediation where MVISION EDR protects high-value endpoints or where administrator credentials may be exposed. The privilege requirement lowers internet-scale risk, but successful abuse could give command execution on endpoints through trusted security tooling.
Technical view
The issue is CWE-78 command injection in MVISION EDR before 3.4.0. The CVSS 3.1 score is 8.4 with high confidentiality, integrity, and availability impact, changed scope, low complexity, no user interaction, and high privileges required.
Likely exposure
Exposure is likely limited to organizations running MVISION EDR versions before 3.4.0 where authenticated MVEDR administrators can use execute reaction. The source bundle does not provide exact affected build ranges beyond prior to 3.4.0.
Exploitation context
The provided sources do not show active exploitation, and this CVE is not listed as KEV in the bundle. Exploitation requires authenticated MVEDR administrator privileges, reducing broad opportunistic risk but increasing insider or credential-compromise concern.
Researcher notes
Evidence is sparse but clear on the core flaw: command injection via execute reaction leading to arbitrary PowerShell execution. Do not assume unauthenticated or remote internet exploitation from the available sources. Version precision is limited to MVISION EDR prior to 3.4.0.
Mitigation direction
- Inventory MVISION EDR deployments and identify versions below 3.4.0.
- Upgrade MVISION EDR to 3.4.0 or later following vendor guidance.
- Restrict MVEDR administrator access to trusted, necessary personnel only.
- Review execute reaction usage and PowerShell execution logs for suspicious activity.
Validation and detection
- Confirm MVISION EDR server and client versions in all managed environments.
- Verify who has MVEDR administrator privileges and execute reaction access.
- Review EDR audit logs for unexpected execute reaction activity.
- Check endpoint telemetry for unusual PowerShell activity tied to EDR operations.
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-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-31838 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
- 8.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/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:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H1.76Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.4HighVector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://kc.mcafee.com/corporate/index?page=content&id=SB10342CVE reference · x_refsource_CONFIRM
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 Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.