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CVE Record

CVE-2021-30343: Improper integrity check can lead to race condition between tasks PDCP and RRC?

Improper integrity check can lead to race condition between tasks PDCP and RRC? after a valid RRC Command packet has been received in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Industrial IOT, Snapdragon Mobile

CriticalCVSS 9.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

This is a critical Qualcomm Snapdragon issue in cellular/control-plane handling. The sources describe an improper integrity check that can create a race condition after a valid RRC command packet is received. Business risk is highest for products using affected Qualcomm chipsets that have not received OEM firmware updates.

Executive priority

Treat as high-priority firmware remediation for affected Qualcomm-based products. The issue is critical by CVSS and can affect confidentiality and integrity, but current provided evidence does not show known active exploitation.

Technical view

CVE-2021-30343 affects listed Snapdragon Auto, Compute, Connectivity, Industrial IoT, and Mobile components. CVSS 3.1 is 9.1 with network attack vector, low complexity, no privileges, no user interaction, high confidentiality impact, high integrity impact, and no availability impact.

Likely exposure

Exposure depends on whether devices, modules, or products use the listed Qualcomm chipsets and whether their OEM firmware incorporates Qualcomm’s April 2022 security bulletin fixes. Mobile, automotive, IoT, compute, and connectivity fleets may be affected.

Exploitation context

The provided bundle does not show CISA KEV listing or public active exploitation. The CVSS vector indicates network reachability without privileges or user interaction, but the sources do not provide exploit details, public exploit status, or attack prerequisites beyond valid RRC command handling.

Researcher notes

Key unresolved details are implementation-specific: exact firmware branches, OEM patch propagation, and practical exposure conditions are not supplied in the bundle. Avoid assuming every listed chipset is exploitable in every product configuration without firmware and vendor mapping.

Mitigation direction

  • Review Qualcomm’s April 2022 Product Security Bulletin for CVE-2021-30343 guidance.
  • Request OEM firmware or BSP updates that address CVE-2021-30343.
  • Prioritize affected Snapdragon assets in mobile, automotive, IoT, compute, and connectivity fleets.
  • Track vendor advisories for device-specific patch availability and deployment requirements.
  • Use compensating controls only where vendor patches are unavailable or delayed.

Validation and detection

  • Inventory devices and modules using the affected Qualcomm part list.
  • Map device firmware versions to OEM advisories referencing CVE-2021-30343.
  • Confirm deployed firmware includes the Qualcomm April 2022 security bulletin fix.
  • Check vulnerability management records for affected Snapdragon components.
  • Document unpatchable assets and owner-approved risk treatment.
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-2021-30343 mapping review

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9.1 (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:N

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
9.1CVSS 3.1CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N3.95.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

9.1Critical
CVSS 3.1 vector shape for CVE-2021-30343Attack 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:N

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 675, SD 8 Gen1 5G, SD480, SD675, SD678, SD690 5G, SD720G, SD730, SD750G, SD765, SD765G, SD768G, SD778G, SD780G, SD865 5G, SD870, SD888, SD888 5G, SDX55, SDX55M, SDX65, SDXR2 5G, SM6250, SM6250P, SM6375, SM7250P, SM7315, SM7325P, WCD9341, WCD9360, WCD9370, WCD9375, WCD9380, WCD9385, WCN3950, WCN3980, 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.