Security readout for executives and security teams
Plain-English summary
This is a high-severity Qualcomm Snapdragon issue affecting listed mobile and connectivity components. The public description points to a memory-handling flaw that could expose or corrupt sensitive device state. Business urgency depends on whether managed devices use the named Snapdragon parts and whether OEM firmware updates include Qualcomm’s April 2022 security fixes.
Executive priority
Prioritize this where affected Qualcomm-based mobile or embedded devices handle sensitive business data. The issue is high severity, but the public bundle does not confirm internet exposure or active exploitation. The main management task is update assurance through OEM firmware channels.
Technical view
CVE-2021-35091 is described as an out-of-bounds read caused by improper typecasting while handling a page fault for global memory in Snapdragon Connectivity and Snapdragon Mobile. CVSS 3.1 is 8.4 with local attack, low complexity, no privileges, no user interaction, unchanged scope, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is limited to devices or embedded products using the listed Qualcomm components: SD 8 Gen1 5G, WCD9380, WCN6855, WCN6856, WSA8830, and WSA8835. Cloud services and non-Qualcomm platforms are not indicated by the supplied sources.
Exploitation context
The supplied data does not show CISA KEV listing or confirmed active exploitation. The CVSS vector indicates local exploitation potential without privileges or user interaction, but public technical detail is sparse. Treat exploitability as plausible for affected devices, not as proven in the wild.
Researcher notes
The description and CVSS score suggest a serious local memory-safety issue, but the public bundle lacks root-cause detail, exploit prerequisites beyond CVSS, and patch version mapping. Avoid assuming affected OEM devices unless their hardware includes the named Qualcomm parts or their vendor advisory maps to this CVE.
Mitigation direction
- Check Qualcomm’s April 2022 bulletin and relevant OEM advisories for fixed firmware.
- Prioritize updates for managed devices using listed Snapdragon components.
- Replace or isolate affected devices that no longer receive OEM security updates.
- Monitor Qualcomm and device vendor advisories for additional affected-platform guidance.
Validation and detection
- Inventory mobile and embedded assets for the listed Qualcomm components.
- Verify OEM firmware or security patch level against Qualcomm’s April 2022 bulletin.
- Confirm unsupported affected devices are documented as residual risk.
- Review mobile device management coverage for update compliance reporting.
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-2021-35091 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
- 8.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/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:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.55.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.4HighVector: CVSS:3.1/AV:L/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.