Security readout for executives and security teams
Plain-English summary
CVE-2021-36311 affects Dell EMC NetWorker versions before 19.5. A malicious local user who already has NetWorker user privileges could place a file in an unauthorized location and execute it, creating a meaningful integrity risk inside backup infrastructure.
Executive priority
Treat as a medium-priority backup infrastructure issue. It is not remotely exploitable from the provided evidence, but backup systems are high-value assets and privileged misuse could undermine recovery trust.
Technical view
The issue is improper authorization, mapped to CWE-285. CVSS 3.1 is 6.0: local attack vector, low complexity, high privileges required, no user interaction, changed scope, high integrity impact, and no stated confidentiality or availability impact.
Likely exposure
Exposure is most likely on systems running Dell EMC NetWorker before version 19.5, especially where local users or service accounts have NetWorker user privileges.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires local access and existing NetWorker user privileges, limiting reach but increasing concern for insider, compromised-account, or backup-server abuse scenarios.
Researcher notes
The public bundle provides limited product-version detail beyond “prior to 19.5” and no exploit indicators. Validation should focus on version inventory, authorization boundaries, local privileged users, and evidence of unauthorized file placement or execution.
Mitigation direction
- Identify all Dell EMC NetWorker installations and versions.
- Prioritize upgrading systems running versions before 19.5.
- Review Dell advisory guidance before applying changes.
- Limit NetWorker user privileges to operationally required accounts.
- Harden local access to NetWorker servers and administrative hosts.
Validation and detection
- Confirm whether each NetWorker instance is version 19.5 or later.
- Review local accounts with NetWorker user privileges.
- Check for unexpected files in sensitive NetWorker-controlled locations.
- Review audit logs for suspicious local file placement or execution.
- Verify compensating controls around privileged backup infrastructure access.
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-285: 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-2021-36311 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
- Medium
- CVSS
- 6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N
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:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N1.54Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6MediumVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.dell.com/support/kbdoc/000192419CVE 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 Authorization
Improper Authorization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.