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CVE Record

CVE-2021-35071: Possible buffer over read due to lack of size validation while copying data from DBR buffer to RX buffer an...

Possible buffer over read due to lack of size validation while copying data from DBR buffer to RX buffer and can lead to Denial of Service in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Wearables, Snapdragon Wired Infrastructure and Networking

MediumCVSS 5.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2021-35071 is a Qualcomm Snapdragon availability flaw. A local, low-privileged actor could trigger a buffer over-read during internal buffer copying and cause denial of service. The supplied sources do not show data theft, integrity impact, remote exploitation, or active exploitation.

Executive priority

Handle through normal vulnerability management, with higher urgency for operationally critical, safety-adjacent, or hard-to-recover devices using affected Snapdragon components.

Technical view

The issue is lack of size validation while copying data from a DBR buffer to an RX buffer, causing possible buffer over-read. CVSS 3.1 is 5.5: AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. Impact is availability only across listed Qualcomm Snapdragon product families.

Likely exposure

Exposure depends on whether enterprise devices, embedded systems, vehicles, IoT, mobile, wearable, or networking equipment use the listed Qualcomm parts. The affected product list is broad, but the supplied version list is truncated, so confirm against Qualcomm and OEM device advisories.

Exploitation context

The CVSS vector indicates local access with low privileges and no user interaction. The source bundle says this CVE is not in KEV and provides no evidence of active exploitation. Treat it as a local denial-of-service risk, not proven remote compromise.

Researcher notes

Evidence supports a local availability issue from missing size validation. The supplied data does not include exploit details, patch identifiers, or complete affected-version coverage. Avoid broad product assumptions beyond Qualcomm's listed Snapdragon families and chipsets.

Mitigation direction

  • Check Qualcomm's April 2022 bulletin and OEM guidance for affected chip-specific updates.
  • Apply vendor or OEM firmware updates through approved maintenance channels.
  • Prioritize systems where device downtime affects safety, connectivity, or operations.
  • For unsupported devices, assess replacement or compensating operational controls.

Validation and detection

  • Inventory devices and map chipsets against Qualcomm's affected product list.
  • Confirm firmware or BSP versions with each OEM or device vendor.
  • Review vulnerability management records for Qualcomm April 2022 bulletin coverage.
  • Validate remediation by confirming vendor update installation status.
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-2021-35071 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-2021-35071Attack 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 Industrial IOT, Snapdragon Mobile, Snapdragon Wearables, Snapdragon Wired Infrastructure and NetworkingAQT1000, AR8035, AR9380, CSR8811, CSRB31024, FSM10055, FSM10056, IPQ4018, IPQ4019, IPQ4028, IPQ4029, IPQ5010, IPQ5018, IPQ5028, IPQ6000, IPQ6010, IPQ6018, IPQ6028, IPQ8064, IPQ8065, IPQ8068, IPQ8070, IPQ8070A, IPQ8071, IPQ8071A, IPQ8072, IPQ8072A, IPQ8074, IPQ8074A, IPQ8076, IPQ8076A, IPQ8078, IPQ8078A, IPQ8173, IPQ8174, PMP8074, QAM8295P, QCA4024, QCA6175A, QCA6390, QCA6391, QCA6426, QCA6428, QCA6436, QCA6438, QCA6554A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584AU, QCA6595, QCA6595AU, QCA6696, QCA7500, QCA8072, QCA8075, QCA8081, QCA8337, QCA9880, QCA9886, QCA9888, QCA9889, QCA9898, QCA9980, QCA9984, QCA9985, QCA9990, QCA9992, QCA9994, QCM2290, QCM4290, QCM6125, QCM6490, QCN5021, QCN5022, QCN5024, QCN5052, QCN5054, QCN5064, QCN5122, QCN5124, QCN5152, QCN5154, QCN5164, QCN5550, QCN6023, QCN6024, QCN6100, QCN6102, QCN6112, QCN6122, QCN6132, QCN9000, QCN9011, QCN9012, QCN9022, QCN9024, QCN9070, QCN9072, QCN9074, QCN9100, QCS2290, QCS4290, QCS610, QCS6125, QCS6490, QCX315, QRB5165, QRB5165M, ...[truncated*]Listed
Weakness

CWE details

No CWE listed

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