Security readout for executives and security teams
Plain-English summary
Dell Hybrid Client before version 1.5 can expose sensitive information to someone with local access, even without authentication. This is mainly a confidentiality risk for managed endpoints, thin-client environments, shared workstations, or devices handling sensitive data.
Executive priority
Treat as a moderate confidentiality issue. Patch during the normal vulnerability cycle, but accelerate remediation for shared endpoints or systems that may store sensitive customer, employee, or operational data.
Technical view
CVE-2021-21537 is a CWE-200 information exposure issue in Dell Hybrid Client prior to 1.5. CVSS 3.1 is 6.2: local attack vector, low complexity, no privileges, no user interaction, high confidentiality impact, and no integrity or availability impact.
Likely exposure
Exposure is limited to systems running Dell Hybrid Client versions earlier than 1.5. The source bundle does not provide CPEs or exact vulnerable build ranges beyond that version boundary.
Exploitation context
The provided sources describe a local unauthenticated attacker viewing and exfiltrating sensitive information. The bundle does not show CISA KEV listing or other evidence of active exploitation.
Researcher notes
The public bundle is sparse: it names information exposure, local unauthenticated access, and the pre-1.5 boundary, but not the affected component, root cause, exposed data class, or exploit method.
Mitigation direction
- Upgrade Dell Hybrid Client to version 1.5 or later.
- Review Dell advisory DSA-2021-071 for vendor-specific update instructions.
- Prioritize shared, kiosk, and sensitive-data endpoints first.
- Restrict local physical or console access where upgrade timing is delayed.
Validation and detection
- Inventory Dell Hybrid Client deployments and record installed versions.
- Flag any Dell Hybrid Client installation earlier than 1.5.
- Confirm upgraded systems report version 1.5 or later.
- Review endpoint access patterns for unusual local data 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-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-2021-21537 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.