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CVE Record

CVE-2021-35084: Possible out of bound read due to lack of length check of data length for a DIAG event in Snapdragon Auto,...

Possible out of bound read due to lack of length check of data length for a DIAG event in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Qualcomm Snapdragon vulnerability in diagnostic event handling. A missing length check can trigger an out-of-bounds read. The CVSS data indicates local, low-privilege access is required, with high availability impact and no stated confidentiality or integrity impact.

Executive priority

Treat this as a moderate firmware supply-chain issue. It is not described as remotely exploitable or actively exploited, but affected Snapdragon platforms are broad. Prioritize inventory accuracy and OEM patch tracking, especially for managed mobile, IoT, automotive, or embedded fleets.

Technical view

CVE-2021-35084 affects multiple Qualcomm Snapdragon product families and listed chipsets. The issue is a possible out-of-bounds read caused by insufficient validation of data length for a DIAG event. CVSS 3.1 is 5.5: local attack vector, low complexity, low privileges, no user interaction, high availability impact.

Likely exposure

Exposure is most likely in devices or embedded systems using the listed Qualcomm Snapdragon chipsets across auto, compute, connectivity, consumer IoT, industrial IoT, mobile, and voice/music categories. Actual risk depends on OEM firmware integration and update status.

Exploitation context

The source bundle does not show CISA KEV listing or active exploitation. CVSS indicates exploitation requires local access and low privileges, with no user interaction. No public exploit status is provided in the supplied sources.

Researcher notes

Evidence is limited to CVE and Qualcomm bulletin data. No CWE, fixed firmware versions, exploit proof, or detailed component behavior are included in the supplied bundle. Avoid assuming affected end-user devices solely from chipset presence without OEM confirmation.

Mitigation direction

  • Check Qualcomm's May 2022 security bulletin for vendor guidance.
  • Apply OEM firmware or security updates that include the Qualcomm fix.
  • Inventory devices using the listed affected Snapdragon chipsets.
  • Prioritize exposed managed devices that allow local user or app execution.
  • Track OEM advisories for device-specific patch availability.

Validation and detection

  • Map hardware models to Qualcomm chipset identifiers listed in the advisory.
  • Confirm device firmware includes relevant May 2022 Qualcomm security updates.
  • Review OEM release notes for CVE-2021-35084 coverage.
  • Verify vulnerable platforms are included in vulnerability management inventory.
  • Document exceptions where OEM patch status is unavailable.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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CVE-2021-35084 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2021-35084Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Qualcomm, Inc.Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & MusicAQT1000, AR8031, AR8035, CSRA6620, CSRA6640, CSRB31024, QCA6174A, QCA6175A, QCA6390, QCA6391, QCA6420, QCA6426, QCA6430, QCA6436, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6595AU, QCA6696, QCA8081, QCA8337, QCA9377, QCA9379, QCM4290, QCM6125, QCN7605, QCN7606, QCS405, QCS410, QCS4290, QCS605, QCS610, QCS6125, QRB5165, QRB5165M, QRB5165N, SA415M, SA515M, SA6155P, SA8155P, SA8195P, SD 8 Gen1 5G, SD460, SD480, SD662, SD680, SD690 5G, SD695, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD855, SD865 5G, SD870, SD888 5G, SDX12, SDX55, SDX55M, SDX65, SDXR2 5G, SM7250P, SM7325P, WCD9335, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WCN3999, WCN6740, WCN6750, WCN6850, WCN6851, WCN6855, WCN6856, WCN7850, WCN7851, WSA8810, WSA8815, WSA8830, WSA8835Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.