CVE-2021-30283
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedPossible denial of service due to improper handling of debug register trap from user applications in Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Mobile
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA denial of service vulnerability exists in Snapdragon chipsets where improper handling of debug register traps from user applications can cause the system to become unavailable. Debug registers are CPU registers used for debugging, and improper exception handling can lead to system crashes or hangs.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE dataall versionsall versionsall versionsall versionsall versionsall versionsall versionsall versionsCVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the Snapdragon chipset model in your deviceCheck the device hardware specifications, bootloader logs, or system information to determine the exact Snapdragon chipset variant (e.g., Qca6391, Qcm6490, Qcs6490, Qrb5165, Qrb5165n, Sd778g, Sd888 5g, Sm7325p)Affected if The chipset matches any of the listed affected models (Qca6391, Qcm6490, Qcs6490, Qrb5165, Qrb516n, Sd778g, Sd888 5g, Sm7325p)
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Locate the firmware version for the chipsetAccess the device firmware image, boot logs, or use vendor-specific tools to read the Qualcomm Snapdragon firmware version. This is typically found in the firmware binary, bootloader, or system information on IoT/embedded devicesAffected if Any firmware version is present on an affected chipset model (all versions are vulnerable)
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Determine if debug register functionality is in useReview system configuration or runtime environment to check if applications or processes are utilizing CPU debug registers (DR0-DR7). This can be observed through kernel debug logs, performance monitoring tools, or by inspecting which processes have debug register access permissionsAffected if User applications or system services are actively using or attempting to access CPU debug registers, triggering the improper exception handling path
You are affected if your device contains any of the listed Snapdragon chipset models (Qca6391, Qcm6490, Qcs6490, Qrb5165, Qrb5165n, Sd778g, Sd888 5g, Sm7325p) regardless of firmware version, and your environment involves code that accesses debug registers.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataApply vendor-supplied firmware/security updates from Qualcomm for affected Snapdragon Consumer IOT, Industrial IOT, and Mobile devices. Coordinate with OEM partners for patch deployment.
- Consultation4.0 h
- Implementation8.0 h
- Testing12.0 h
- Review / QA6.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $8,192.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-30283 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-30283 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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