Security readout for executives and security teams
Plain-English summary
CVE-2021-35123 is a Qualcomm Snapdragon wireless-stack flaw where over-the-air GATT notification data may be copied without proper length checking. A nearby unauthenticated attacker could potentially affect confidentiality, integrity, and availability on devices using listed Snapdragon Connectivity or Industrial IoT components.
Executive priority
Treat as high priority for fleets with Qualcomm-based mobile, IoT, or industrial devices, especially where wireless proximity attacks matter. Business urgency depends on whether affected chipsets are present and whether OEM firmware updates are available.
Technical view
The CVE describes an improper length check during buffer copy handling for GATT multi notification data received over the air. CVSS 3.1 is 8.8 with adjacent attack vector, low complexity, no privileges, no user interaction, unchanged scope, and high CIA impact.
Likely exposure
Exposure is most likely in phones, IoT, industrial, or embedded products incorporating the listed Qualcomm chipsets and firmware. Asset owners usually need device model and firmware information, not just chipset names, to confirm exposure through OEM advisories.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The CVSS vector indicates adjacent-range attack conditions with no authentication or user interaction, but the bundle does not provide exploit maturity details or public proof-of-concept evidence.
Researcher notes
The bundle identifies the vulnerability class and affected Qualcomm component families but does not include CWE, exploit details, or device-level firmware mapping. Validation should focus on chipset-to-device correlation and OEM patch status rather than assumptions from Qualcomm part numbers alone.
Mitigation direction
- Check Qualcomm April 2022 bulletin and OEM advisories for firmware guidance.
- Prioritize updates for devices using listed Snapdragon Connectivity or Industrial IoT components.
- Ask vendors to map device models to the affected Qualcomm chipset list.
- Apply OEM firmware or operating system updates when available.
- Reduce unnecessary wireless/GATT exposure where operationally feasible pending vendor guidance.
Validation and detection
- Inventory devices with Qualcomm Snapdragon Connectivity or Industrial IoT components.
- Compare chipset and firmware details against the affected product list.
- Review OEM security bulletins for CVE-2021-35123 remediation status.
- Confirm deployed firmware includes the vendor-provided fix when documented.
- Track exceptions for unsupported or unpatchable embedded devices.
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-2021-35123 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:A/AC:L/PR:N/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.