LiveActive security incident?Get immediate response
CVE Record

CVE-2021-35100: Possible buffer over read due to improper calculation of string length while parsing Id3 tag in Snapdragon...

Possible buffer over read due to improper calculation of string length while parsing Id3 tag in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music, Snapdragon Wearables

HighCVSS 7.5Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-35100 is a Qualcomm Snapdragon flaw in ID3 tag parsing that can cause a buffer over-read. The published CVSS rating is high because exploitation is modeled as remote, low complexity, unauthenticated, and without user interaction, with high availability impact. The sources do not show confirmed active exploitation.

Executive priority

Treat this as a high-priority firmware exposure review, especially for managed mobile, IoT, automotive, and embedded Snapdragon assets. Urgency is higher where devices are network-reachable or hard to patch. There is no sourced evidence here of active exploitation.

Technical view

The vulnerability is described as improper string length calculation while parsing an ID3 tag, causing a possible buffer over-read across many Snapdragon product families. CVSS 3.1 is 7.5: AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. The disclosed impact is availability, not confidentiality or integrity.

Likely exposure

Organizations may be exposed through devices using the listed Qualcomm Snapdragon Auto, Compute, Connectivity, Consumer IoT, Industrial IoT, Mobile, Voice and Music, or Wearables platforms. Actual exposure depends on the chipset, OEM firmware, and whether vulnerable Qualcomm media or tag parsing components are present.

Exploitation context

The bundle marks KEV as false and provides no cited evidence of active exploitation. CVSS indicates network reachability and no required privileges or user interaction, but the sources do not provide exploit details, observed attacks, or practical exploitability evidence.

Researcher notes

The affected product list is broad and chipset-oriented, so validation should map Qualcomm part numbers to actual deployed products. The source bundle does not include CWE, proof of concept, exploit status, or specific fixed versions beyond the Qualcomm bulletin reference.

Mitigation direction

  • Review Qualcomm’s April 2022 security bulletin for vendor guidance.
  • Identify OEM firmware updates covering CVE-2021-35100.
  • Prioritize affected internet-connected, automotive, IoT, and mobile assets.
  • Use official OEM or carrier update channels only.
  • Apply compensating controls where firmware cannot be updated promptly.

Validation and detection

  • Inventory devices for affected Snapdragon chipsets listed by Qualcomm.
  • Confirm current firmware or security patch level with the OEM.
  • Check vulnerability scanners for CVE-2021-35100 coverage.
  • Review asset classes where ID3/media parsing is reachable.
  • Document unsupported devices requiring risk acceptance 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.

cve · low confidence lookup

CVE-2021-35100 mapping review

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

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/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
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2021-35100Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/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 IOT, Snapdragon Industrial IOT, Snapdragon Mobile, Snapdragon Voice & Music, Snapdragon WearablesAPQ8009W, APQ8017, APQ8064AU, APQ8096AU, AQT1000, AR8031, CSRA6620, CSRA6640, FSM10055, FSM10056, MDM9206, MDM9250, MDM9607, MDM9628, MSM8909W, MSM8996AU, QCA6174A, QCA6390, QCA6391, QCA6426, QCA6436, QCA6564A, QCA6564AU, QCA6574, QCA6574A, QCA6574AU, QCA6584AU, QCA6595AU, QCA6696, QCA9367, QCA9377, QCM2290, QCM4290, QCM6125, QCM6490, QCS2290, QCS405, QCS410, QCS4290, QCS603, QCS605, QCS610, QCS6125, QCS6490, Qualcomm215, SA6145P, SA6150P, SA6155, SA6155P, SA8145P, SA8150P, SA8155, SA8155P, SA8195P, SD 675, SD 8 Gen1 5G, SD205, SD210, SD429, SD460, SD480, SD662, SD675, SD678, SD690 5G, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD855, SD865 5G, SD870, SD888, SD888 5G, SDA429W, SDM429W, SDW2500, SDX20, SDX55M, SDXR2 5G, SM6250, SM6375, SM7250P, SM7315, SM7325P, WCD9326, WCD9330, WCD9335, WCD9340, WCD9341, WCD9370, WCD9375, WCD9380, WCD9385, WCN3610, WCN3620, WCN3660B, WCN3680B, WCN3910, WCN3950, WCN3980, WCN3988, WCN3990, WCN3991, WCN3998, WCN3999, WCN6740, WCN6750, WCN6850, ...[truncated*]Listed
Weakness

CWE details

No CWE listed

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