CVE-2021-36323
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 · uneditedDell BIOS contains an improper input validation vulnerability. A local authenticated malicious user may potentially exploit this vulnerability by using an SMI to gain arbitrary code execution in SMRAM.
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 confidenceThis is a firmware-level vulnerability in Dell BIOS where improper input validation allows a local authenticated user to exploit via System Management Interrupt (SMI) to achieve arbitrary code execution in System Management RAM (SMRAM). This provides code execution at the highest privilege level outside of the main operating system.
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< 1.13.0< 1.13.0< 1.14.0< 1.13.0< 1.14.0< 1.15.1< 1.10.0< 1.0.9CVSS 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
- High
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:L/AC:L/PR:H/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.
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Identify the exact Dell Alienware system modelRun `dmidecode -s system-product-name` or check the system label/sticker on the deviceAffected if The model is not one of: Alienware 13 R3, 15 R3, 15 R4, 17 R4, 17 R5, Area 51m R1, Area 51m R2, or Aurora R11 (not affected)
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Locate the current BIOS firmware versionRun `dmidecode -s bios-version` on Linux, or check in BIOS setup (press F2 during boot), or use Dell SupportAssist/Command Update utility on WindowsAffected if Unable to retrieve a BIOS version number (firmware may not be readable)
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Compare installed version against the affected threshold for your modelMatch your model to its version threshold: 13 R3/15 R3/17 R4 need <1.13.0; 15 R4/17 R5 need <1.14.0; Area 51m R1 needs <1.15.1; Area 51m R2 needs <1.10.0; Aurora R11 needs <1.0.9Affected if The installed version is lower than the threshold for your specific model (vulnerable)
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Verify System Management Mode (SMM) is accessibleThis is a firmware-level flaw requiring SMI trigger; check if the system has SMM enabled in BIOS settings under Advanced or Security tabs, or confirm the vulnerability is exploitable if you have local authenticated accessAffected if SMI handlers exist and process input without validation (the vulnerability exists regardless of SMM configuration, but exploitation requires local authenticated access)
You are affected if you own an Alienware 13 R3, 15 R3, 15 R4, 17 R4, 17 R5, Area 51m R1, Area 51m R2, or Aurora R11 system AND your current BIOS firmware version is below the threshold specified for your model.
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.
dbcve · scoped1.0.91.10.01.13.0
Apply Dell BIOS/firmware updates to patch the improper input validation vulnerability. Organizations should identify affected Dell systems using enterprise management tools and deploy BIOS updates through controlled deployment processes.
BIOS firmware 1.13.0 (Alienware 13 R3/15 R3/17 R4), 1.14.0 (Alienware 15 R4/17 R5), 1.15.1 (Alienware Area 51m R1), 1.10.0 (Alienware Area 51m R2), or 1.0.9 (Alienware Aurora R11)
- 1. Identify the exact Alienware model number (e.g., Alienware 15 R4) from the system label or BIOS information
- 2. Navigate to Dell's support website (www.dell.com) and enter the service tag or search for the specific model
- 3. Locate the "Drivers & Downloads" section for the identified model
- 4. Under the BIOS category, download the firmware version that matches or exceeds the fixed version for your model: Alienware 13 R3/15 R3/17 R4 -> 1.13.0, Alienware 15 R4/17 R5 -> 1.14.0, Alienware Area 51m R1 -> 1.15.1, Alienware Area 51m R2 -> 1.10.0, Alienware Aurora R11 -> 1.0.9
- 5. Review the firmware release notes to confirm the security fix addresses CVE-2021-36323
- 6. Connect the system to AC power and ensure battery is sufficiently charged
- 7. Run the downloaded BIOS update executable or follow Dell's instruction to create a USB bootable update
- 8. Allow the firmware update to complete without interrupting the system; the machine will reboot automatically
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation8.0 h
- Implementation16.0 h
- Testing4.0 h
- Review / QA2.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-36323 — 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-2021-36323 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
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