CVE-2021-30341
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 · uneditedImproper buffer size validation of DSM packet received can lead to memory corruption in Snapdragon Auto, Snapdragon Compute, Snapdragon Connectivity, Snapdragon Consumer Electronics Connectivity, Snapdragon Consumer IOT, Snapdragon Industrial IOT, Snapdragon Wearables
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 confidenceImproper buffer size validation of received DSM (Diagnostic Services Module) packets can lead to memory corruption. This is a classic buffer overflow vulnerability where incoming packet data is copied into fixed-size buffers without adequate size checks, allowing an attacker to overwrite adjacent memory and potentially achieve code execution.
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
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.
-
Identify the Qualcomm firmware productCheck the device/system documentation, bootloader banner, or system information for the exact model number (e.g., Apq8009w, Mdm9206, etc.)Affected if The product matches any of: Apq8009w, Apq8096au, Aqt1000, Ar8035, Csrb31024, Mdm8207, Mdm9205, or Mdm9206
-
Determine if DSM (Diagnostic Services Module) is enabledInspect the running services, loaded kernel modules, or firmware configuration for the presence of DSM or diagnostic services handling incoming network or debug packetsAffected if DSM/Diagnostic Services Module is actively running or loaded on the affected device
-
Verify DSM packet processing is in useMonitor network traffic or debug interfaces (e.g., debug ports, diagnostic channels) for incoming DSM packets, or inspect firmware configuration for DSM packet handlersAffected if The system processes DSM packets from external or untrusted sources
-
Check for buffer overflow indicatorsReview system logs, memory dumps, or crash reports for signs of memory corruption, unexpected resets, or anomalous memory writes adjacent to buffer allocations in DSM handling codeAffected if Memory corruption or unexpected behavior occurs in DSM packet processing code paths
A user is affected if their device runs any of the listed Qualcomm firmware products (Apq8009w, Apq8096au, Aqt1000, Ar8035, Csrb31024, Mdm8207, Mdm9205, Mdm9206) and has DSM/Diagnostic Services Module enabled and processing incoming packets.
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 firmware updates provided by Qualcomm and downstream device/OEM manufacturers that implement proper bounds checking on DSM packet sizes before memory allocation operations.
- Consultation8.0 h
- Implementation24.0 h
- Testing16.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $15,616.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-30341 — 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-2021-30341 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
Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.
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
- No spam, self-promotion, credentials, or personal data