Security readout for executives and security teams
Plain-English summary
CVE-2021-35129 is a high-severity Qualcomm Snapdragon Bluetooth controller flaw. A local, low-privileged attacker could trigger memory corruption while the controller handles vendor-specific commands, potentially compromising confidentiality, integrity, and availability on affected devices.
Executive priority
Prioritize remediation for managed endpoints, IoT, networking, and mobile fleets where affected Qualcomm hardware is present. The business risk is high because successful exploitation could affect data confidentiality, integrity, and availability, but current bundle evidence does not show active exploitation.
Technical view
The issue is an improper length check in the BT controller when processing vendor-specific commands. The CVSS 3.1 vector is AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H, indicating local access, low complexity, low privileges, no user interaction, and high impact across CIA.
Likely exposure
Exposure is tied to devices using the listed Qualcomm Snapdragon, QCA, QCN, WCN, WCD, WSA, SDX, and related chipsets. Asset owners need OEM firmware mapping because end-user product names are not provided in the bundle.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. The scoring indicates exploitation requires local access and low privileges, with no user interaction. Evidence is insufficient to claim remote exploitation or public weaponization.
Researcher notes
Focus analysis on local paths that can submit vendor-specific Bluetooth controller commands on affected firmware. The source bundle does not provide CWE, patch detail, proof-of-concept status, or OEM product mappings, so validation depends on chipset and firmware correlation.
Mitigation direction
- Inventory devices using the affected Qualcomm chipsets listed for this CVE.
- Check Qualcomm and OEM guidance for April 2022 bulletin coverage.
- Apply OEM firmware updates that address CVE-2021-35129 when available.
- Reduce unnecessary local privileges on systems using affected hardware.
- Track vendor exceptions where firmware is unavailable or unsupported.
Validation and detection
- Map device models to the affected Qualcomm part numbers in the source bundle.
- Confirm current firmware against Qualcomm or OEM April 2022 security guidance.
- Verify release notes explicitly reference CVE-2021-35129 or the relevant Qualcomm bulletin.
- Document devices that cannot be patched and their compensating controls.
- Monitor for later vendor advisories or KEV status changes.
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.
CVE-2021-35129 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://www.qualcomm.com/company/product-security/bulletins/april-2022-bulletinCVE reference · x_refsource_CONFIRM
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.