Security readout for executives and security teams
Plain-English summary
Dell Hybrid Client before version 1.5 can expose sensitive information. The attacker does not need a login, but must have local access to the client. The main business risk is unauthorized viewing of confidential data from affected endpoint deployments.
Executive priority
Treat this as a moderate confidentiality issue. It is less urgent than remotely exploitable flaws, but should be remediated promptly where Dell Hybrid Client devices are shared, public-facing, or handle sensitive data.
Technical view
CVE-2021-21536 is a CWE-200 information exposure issue in Dell Hybrid Client versions prior to 1.5. The CVSS 3.1 score is 6.2 with local attack vector, low complexity, no privileges, no user interaction, and high confidentiality impact only.
Likely exposure
Organizations using Dell Hybrid Client versions earlier than 1.5 are potentially exposed, especially shared, kiosk, thin-client, or physically accessible endpoint environments. The source bundle does not identify affected CPEs or specific deployment configurations.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not report active exploitation. The described attack requires local unauthenticated access and involves registering the client to a server to view sensitive information.
Researcher notes
Evidence is limited to the CVE record and Dell advisory reference. The issue is confidentiality-only by CVSS, local, unauthenticated, and non-interactive. No exploit details, indicators of compromise, or configuration-specific exposure notes are provided in the source bundle.
Mitigation direction
- Upgrade Dell Hybrid Client to version 1.5 or later.
- Review Dell advisory DSA-2021-071 for current vendor guidance.
- Prioritize remediation on shared or physically accessible clients.
- Restrict local access to affected Dell Hybrid Client systems.
- Review client registration controls and administrative monitoring.
Validation and detection
- Inventory Dell Hybrid Client installations and record versions.
- Flag any Dell Hybrid Client version earlier than 1.5.
- Review registration records for unknown or unauthorized clients.
- Confirm upgraded systems report version 1.5 or later.
- Check Dell guidance for any additional verification steps.
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-2021-21536 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
- 6.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/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:H/I:N/A:N2.53.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.2MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/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.