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CVE Record

CVE-2021-30340: Reachable assertion due to improper validation of coreset in PDCCH configuration in SA mode in Snapdragon A...

Reachable assertion due to improper validation of coreset in PDCCH configuration in SA mode in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2021-30340 is a Qualcomm Snapdragon vulnerability that can cause affected devices or components to hit an assertion failure. The published impact is availability only: service disruption, not data theft or privilege escalation. It matters most for fleets using listed Snapdragon Auto, Compute, Connectivity, Industrial IoT, or Mobile chipsets.

Executive priority

Treat as a high-priority availability risk for affected Qualcomm-based products, especially managed fleets, vehicles, industrial devices, and mobile estates. Business urgency depends on whether the organization operates listed chipsets and whether vendors provide patched firmware.

Technical view

The flaw is improper validation of CORESET in PDCCH configuration in 5G standalone mode. Qualcomm describes a reachable assertion. CVSS 3.1 is 7.5, network-accessible, low complexity, no privileges, no user interaction, with high availability impact and no stated confidentiality or integrity impact.

Likely exposure

Exposure is limited to products using the listed Qualcomm components and relevant Snapdragon platforms. The source bundle names many affected chipsets, but does not map them to specific OEM device models, firmware versions, or carrier builds.

Exploitation context

The CVE is not listed as CISA KEV in the bundle, and no cited source states active exploitation. The CVSS vector indicates remote network reachability without authentication or user interaction, but the provided sources do not include exploit details.

Researcher notes

Evidence supports a reachable assertion caused by improper validation in SA-mode PDCCH configuration. No CWE is listed. The source bundle does not provide crash conditions, affected OEM models, patch version identifiers, or exploit-in-the-wild evidence.

Mitigation direction

  • Check Qualcomm’s April 2022 bulletin for CVE-2021-30340 guidance.
  • Obtain fixed firmware or platform updates from the device OEM or module supplier.
  • Prioritize assets using listed Snapdragon Mobile, Auto, IoT, Compute, or Connectivity parts.
  • Ask vendors for supported compensating controls if update timing is unclear.

Validation and detection

  • Inventory devices and modules for the listed Qualcomm chipset identifiers.
  • Confirm whether affected assets support or use 5G standalone mode.
  • Check OEM firmware release notes for explicit CVE-2021-30340 coverage.
  • Track unresolved assets where vendor patch status cannot be confirmed.
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-2021-30340 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
7.5 (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-2021-30340Attack 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 Industrial IOT, Snapdragon MobileAR8035, QCA6390, QCA6391, QCA6426, QCA6436, QCA6574A, QCA6574AU, QCA6595AU, QCA6696, QCA8081, QCA8337, QCM6490, QCS6490, QCX315, SA515M, SD 8 Gen1 5G, SD480, SD690 5G, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD865 5G, SD870, SD888 5G, SDX55, SDX55M, SDX65, SDXR2 5G, SM6375, SM7250P, SM7325P, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3988, WCN3991, WCN3998, WCN6740, WCN6750, WCN6850, WCN6851, WCN6855, WCN6856, 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.