CVE-2021-32486
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 · uneditedIn modem 2G RRM, there is a possible system crash due to a heap buffer overflow. This could lead to remote denial of service with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY00500621; Issue ID: ALPS04964928.
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 · high confidenceA heap buffer overflow vulnerability exists in the modem's 2G Radio Resource Management (RRM) component. This memory corruption issue can be triggered remotely, causing system crash and leading to complete denial of service. No user interaction or elevated privileges are required for exploitation.
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 data= lr12a= lr13CVSS 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
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/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 Mediatek modem in useCheck system information or modem diagnostics to confirm the device uses a Mediatek modem chipsetAffected if The system does not use a Mediatek modem chipset (not lr12a or lr13)
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Check modem model versionQuery modem firmware information to determine if the model is lr12a or lr13Affected if Modem model is lr12a or lr13 and firmware has not been updated
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Verify 2G/RRM component is enabledCheck modem radio configuration settings to confirm 2G (GSM) network support or RRM functionality is activeAffected if 2G support and RRM component are disabled in the modem configuration
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Check current modem firmware patch levelQuery the installed modem firmware version and compare against the vendor patch MOLY00500621Affected if Modem firmware is older than the patched version MOLY00500621 or the patch has not been applied
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Confirm exploitability via network accessVerify the modem is accessible over the mobile network and can receive radio resource management messagesAffected if Modem is reachable and 2G RRM processing is active without the vendor patch applied
User is affected if their device contains a Mediatek lr12a or lr13 modem with 2G RRM enabled and firmware versions prior to the MOLY00500621 patch.
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 patch MOLY00500621 to update the modem firmware and fix the heap buffer overflow in the 2G RRM component.
- Consultation2.0 h
- Implementation8.0 h
- Testing8.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,016.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-32486 — 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-2021-32486 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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- 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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