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CVE Record

CVE-2021-35104: Possible buffer overflow due to improper parsing of headers while playing the FLAC audio clip in Snapdragon...

Possible buffer overflow due to improper parsing of headers while playing the FLAC audio clip in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Voice & Music, Snapdragon Wearables, Snapdragon Wired Infrastructure and Networking

CriticalCVSS 9.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2021-35104 is a critical Qualcomm Snapdragon flaw involving unsafe parsing of FLAC audio headers. If an affected device processes malicious FLAC content, the issue could cause memory corruption with high confidentiality, integrity, and availability impact. The source bundle does not prove real-world exploitation.

Executive priority

Treat this as high-priority embedded-device risk. The CVSS score is critical, but urgency should be driven by whether affected Qualcomm-based products are deployed, exposed, and vendor-patchable. Focus first on inventory and OEM firmware status.

Technical view

The CVE describes a possible buffer overflow in Snapdragon products caused by improper FLAC header parsing during audio clip playback. CVSS 3.1 is 9.8 with network attack vector, low complexity, no privileges, no user interaction, unchanged scope, and high CIA impact.

Likely exposure

Exposure is most likely in products using the listed Qualcomm Snapdragon chipsets across auto, compute, connectivity, IoT, voice and music, wearables, and wired infrastructure. Actual exposure depends on OEM firmware, enabled media-processing paths, and whether the product can receive or process FLAC audio content.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation. Attack details are incomplete. The CVSS vector indicates a remotely reachable, unauthenticated, low-complexity condition, while the description ties the bug to FLAC audio header parsing during playback.

Researcher notes

Evidence is limited to the CVE record and Qualcomm bulletin reference. The bundle has no CWE, no exploit confirmation, and an incomplete affected-version list. Avoid assuming downstream OEM product impact without firmware-specific confirmation.

Mitigation direction

  • Review Qualcomm's April 2022 security bulletin for official remediation guidance.
  • Identify OEM firmware updates for products using affected Qualcomm chipsets.
  • Prioritize updates for network-exposed or remotely managed embedded devices.
  • Limit processing of untrusted FLAC audio where operationally feasible.
  • Ask vendors to confirm whether their firmware includes the Qualcomm fix.

Validation and detection

  • Map deployed hardware models to Qualcomm chipset identifiers in the CVE record.
  • Verify firmware versions against OEM and Qualcomm security bulletin guidance.
  • Confirm media/audio components are updated through vendor release notes.
  • Check vulnerability management data for affected embedded or IoT assets.
  • Document unsupported devices requiring compensating controls or replacement.
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-2021-35104 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
Critical
CVSS
9.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/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
9.8CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

9.8Critical
CVSS 3.1 vector shape for CVE-2021-35104Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/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 Consumer IOT, Snapdragon Industrial IOT, Snapdragon Voice & Music, Snapdragon Wearables, Snapdragon Wired Infrastructure and NetworkingAPQ8009W, APQ8017, APQ8064AU, APQ8096AU, AQT1000, AR8031, AR8035, CSR8811, CSRA6620, CSRA6640, CSRB31024, FSM10055, FSM10056, IPQ6000, IPQ6010, IPQ6018, IPQ6028, IPQ8070, IPQ8070A, IPQ8071, IPQ8071A, IPQ8072, IPQ8072A, IPQ8074, IPQ8074A, IPQ8076, IPQ8076A, IPQ8078A, IPQ8173, IPQ8174, MDM9150, MDM9206, MDM9250, MDM9607, MDM9628, MSM8909W, MSM8996AU, QAM8295P, QCA4024, QCA6174A, QCA6390, QCA6391, QCA6426, QCA6428, QCA6436, QCA6438, QCA6564, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584AU, QCA6595AU, QCA6696, QCA8075, QCA8081, QCA8337, QCA9367, QCA9377, QCA9889, QCM2290, QCM4290, QCM6125, QCM6490, QCN5022, QCN5024, QCN5052, QCN5064, QCN5122, QCN5124, QCN5152, QCN5164, QCN5550, QCN9000, QCN9011, QCN9012, QCN9074, QCS2290, QCS405, QCS410, QCS4290, QCS603, QCS605, QCS610, QCS6125, QCS6490, QCX315, QRB5165, QRB5165M, QRB5165N, QSM8250, QSW8573, SA4150P, SA4155P, SA415M, SA515M, SA6145P, SA6150P, SA6155, SA6155P, SA8145P, SA8150P, SA8155, SA8155P, SA8195P, SA8295P, SD 675, SD 8 Gen1 5G, S ...[truncated*]Listed
Weakness

CWE details

No CWE listed

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