Security readout for executives and security teams
Plain-English summary
This is a high-severity BIOS firmware issue affecting some HP Workstation products. A local user could potentially gain improper privileges in firmware-level code, creating risk to confidentiality, integrity, and availability. HP says firmware updates are being released to mitigate it.
Executive priority
Prioritize this for organizations with HP Workstation fleets. The issue requires local access, reducing internet-scale urgency, but BIOS-level privilege weaknesses can undermine endpoint trust and are harder to monitor than normal software vulnerabilities.
Technical view
CVE-2021-3439 is a CWE-269 improper privilege management issue in HP PC BIOS for some Workstation products. CVSS 3.1 is 7.8 with local attack vector, low complexity, low privileges, no user interaction, and high impact to confidentiality, integrity, and availability.
Likely exposure
Exposure is limited to HP Workstation systems running affected BIOS firmware versions listed in HP's security bulletin. The bundle does not include the specific model or BIOS version list, so inventory must be checked against HP's advisory.
Exploitation context
The CVSS vector indicates local access with low privileges is required. The source bundle does not cite public exploitation, and the CVE is not marked as CISA KEV. Treat active exploitation as unconfirmed based on provided evidence.
Researcher notes
The available sources provide severity, affected product family, CWE, CVSS vector, and HP's mitigation direction, but not detailed root cause, exploit mechanics, or full affected-version data. Use the HP bulletin as the authoritative exposure source.
Mitigation direction
- Review HP security bulletin HPSBHF03735 for affected models and BIOS versions.
- Apply the applicable HP BIOS firmware updates from official HP support channels.
- Prioritize shared workstations and systems used by privileged engineering or administrative users.
- Restrict unnecessary local user access until firmware status is verified.
- Track exceptions where firmware updates are unavailable or deferred.
Validation and detection
- Inventory HP Workstation models and current BIOS firmware versions.
- Compare each system against HP bulletin HPSBHF03735 affected-version guidance.
- Confirm updated BIOS versions after remediation through endpoint inventory tooling.
- Check whether local non-administrative users can access affected systems.
- Document systems not covered by HP's available firmware updates.
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-269: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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-2021-3439 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://support.hp.com/us-en/document/ish_3982318-3982351-16/hpsbhf03735CVE reference
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 Privilege Management
Improper Privilege Management represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.