CVE-2021-21529
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 System Update (DSU) 1.9 and earlier versions contain a denial of service vulnerability. A local authenticated malicious user with low privileges may potentially exploit this vulnerability to cause the system to run out of memory by running multiple instances of the vulnerable application.
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 confidenceDell System Update (DSU) versions 1.9 and earlier contain a denial of service vulnerability where a local authenticated user with low privileges can exhaust system memory by running multiple instances of the DSU application, causing a resource exhaustion condition.
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< 1.9CVSS 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
- 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 Dell System Update installationCheck for DSU in the system by looking in Program Files, Program Files (x86), or via Add/Remove Programs for 'Dell System Update' or 'DSU' entryAffected if Dell System Update is installed on the system
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Determine installed DSU versionLocate the DSU executable or installation directory and check its version properties, or use 'wmic product get name,version' or 'Get-WmiObject Win32_Product' on Windows to query the installed versionAffected if The installed version is 1.9 or earlier (versions prior to the patch)
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Verify current running DSU processesOpen Task Manager or run 'tasklist | findstr -i dsu' or 'Get-Process *dsu*' to list any currently running DSU processesAffected if Multiple concurrent DSU processes are observed, indicating possible exploitation
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Check process limits or resource controlsReview system resource monitoring tools or logs for signs of memory exhaustion correlated with DSU usage patternsAffected if High memory consumption is observed from multiple DSU instances running simultaneously
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Confirm user privilege contextVerify that low-privilege authenticated users can execute DSU by checking file permissions on the DSU installation directory and executableAffected if Low-privilege users have execute permissions on DSU without restrictions
A system is affected if Dell System Update version 1.9 or earlier is installed and low-privilege users can run multiple concurrent instances, leading to potential memory exhaustion.
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 data1.9
Update Dell System Update to a patched version beyond 1.9, or implement process controls to limit concurrent DSU instances and monitor for anomalous resource consumption.
- Consultation2.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-21529 — 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-2021-21529 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
- No spam, self-promotion, credentials, or personal data