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CVE Record

CVE-2021-35102: Possible buffer overflow due to lack of validation for the length of NAI string read from EFS in Snapdragon...

Possible buffer overflow due to lack of validation for the length of NAI string read from EFS in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Mobile

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-35102 is a Qualcomm Snapdragon vulnerability where a stored network identifier string may be read without proper length validation. On affected devices, this can cause a buffer overflow with high confidentiality, integrity, and availability impact. The sources do not show active exploitation.

Executive priority

Treat as high priority for fleets with affected Qualcomm-based devices, especially managed mobile, automotive, or embedded assets. The business risk is serious impact after local compromise, but the sources do not justify emergency active-exploitation response.

Technical view

The flaw is a possible buffer overflow in Qualcomm Snapdragon Auto, Compute, Connectivity, and Mobile products involving the NAI string read from EFS. CVSS 3.1 rates it 7.8: local attack vector, low complexity, low privileges, no user interaction, and high CIA impact.

Likely exposure

Exposure is most likely in devices, modules, and platforms using the listed Qualcomm Snapdragon chipsets. Organizations usually need OEM device model and firmware mapping because Qualcomm components are embedded in phones, vehicles, connectivity modules, and compute devices.

Exploitation context

The provided CVSS vector indicates local access with low privileges is required. The source bundle does not include proof of exploitation, public exploit availability, or CISA KEV listing, so active exploitation should not be assumed.

Researcher notes

Key constraints are sparse public detail and component-level affected identifiers. Validate exposure through chipset and OEM firmware correlation. Do not infer remote exploitability; the CVSS vector is local, low privilege, no user interaction.

Mitigation direction

  • Review Qualcomm's June 2022 bulletin and follow OEM-specific firmware guidance.
  • Prioritize updates for devices using listed Snapdragon chipsets in managed fleets.
  • Track vendor advisories for affected Auto, Compute, Connectivity, and Mobile products.
  • Restrict local access on affected devices until vendor remediation is confirmed.

Validation and detection

  • Map device models to Qualcomm chipset identifiers listed in the bulletin.
  • Confirm current firmware or security patch level with OEM inventory data.
  • Check Qualcomm and OEM advisories for CVE-2021-35102 remediation status.
  • Document exceptions where products cannot receive firmware updates.
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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

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CVE-2021-35102 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
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

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
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2021-35102Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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 MobileAR8035, QCA6390, QCA6391, QCA6421, QCA6426, QCA6431, QCA6436, QCA6574A, QCA6574AU, QCA6595AU, QCA6696, QCA8081, QCA8337, SA515M, SD 675, SD 8 Gen1 5G, SD480, SD675, SD678, SD690 5G, SD695, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD855, SD865 5G, SD870, SD888, SD888 5G, SDX55, SDX55M, SDX65, SDXR2 5G, SM6250, SM6250P, SM7250P, SM7315, SM7450, SM8475, SM8475P, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WCN6740, WCN6750, WCN6850, WCN6851, WCN6855, WCN6856, WCN7851, WSA8810, WSA8815, WSA8830, WSA8832, 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.