Security readout for executives and security teams
Plain-English summary
Dell Hybrid Client before version 1.5 could expose sensitive information through a local API. The attacker needs local access to the affected device but does not need authentication. This is a confidentiality issue, not a known remote takeover or outage risk based on the provided sources.
Executive priority
Treat this as a targeted endpoint confidentiality issue. It is not described as remotely exploitable, but shared endpoint environments should patch promptly because unauthenticated local access may expose sensitive information.
Technical view
CVE-2021-21534 is CWE-200 information exposure in Dell Hybrid Client versions prior to 1.5. CVSS 3.1 is 4.0 with local attack vector, low complexity, no privileges, no user interaction, unchanged scope, and low confidentiality impact only.
Likely exposure
Exposure is likely limited to environments running Dell Hybrid Client versions earlier than 1.5 on endpoints where an unauthenticated local user can interact with the local API.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. Exploitation requires local access, so risk rises on shared workstations, kiosk-like deployments, or endpoints with weak local access controls.
Researcher notes
Public detail is limited. The sources identify the affected product, version threshold, local unauthenticated access path, CWE, and CVSS vector, but not the exact sensitive data exposed or API behavior.
Mitigation direction
- Upgrade Dell Hybrid Client to version 1.5 or later.
- Review Dell advisory DSA-2021-071 for vendor-specific remediation guidance.
- Prioritize shared or multi-user Dell Hybrid Client endpoints.
- Limit local user access to affected systems until remediated.
Validation and detection
- Inventory Dell Hybrid Client installations and installed versions.
- Flag any Dell Hybrid Client version earlier than 1.5.
- Confirm remediation against Dell advisory DSA-2021-071.
- Review local access assumptions for affected endpoint groups.
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-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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-2021-21534 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
- 4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/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:N/UI:N/S:U/C:L/I:N/A:N2.51.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.dell.com/support/kbdoc/en-us/000184667/dsa-2021-071-dell-hybrid-client-security-update-for-multiple-vulnerabilitiesCVE 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.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.