CVE-2021-21549
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 EMC XtremIO Versions prior to 6.3.3-8, contain a Cross-Site Request Forgery Vulnerability in XMS. A non-privileged attacker could potentially exploit this vulnerability, leading to a privileged victim application user being tricked into sending state-changing requests to the vulnerable application, causing unintended server operations.
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 EMC XtremIO XMS contains a Cross-Site Request Forgery (CSRF) vulnerability allowing non-privileged attackers to trick authenticated privileged users into unknowingly submitting malicious state-changing requests to the XMS web interface, potentially causing unauthorized server operations.
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< 6.3.3-8CVSS 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
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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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Confirm Dell XtremIO XMS is installedIdentify whether the Dell XtremIO Management Server (XMS) software is present in your environment. Check system inventory, running services, or installed applications for XMS components.Affected if XMS is installed and running in your environment
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Determine XMS versionLocate and retrieve the installed version of Dell XtremIO XMS. This is typically found in the XMS web interface (usually accessed via HTTPS on port 443), in system documentation, or using XMS CLI commands to query the software version.Affected if The installed version is below 6.3.3-8 (e.g., 6.x versions prior to 6.3.3-8, or earlier major versions)
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Verify web interface accessibilityDetermine if the XMS web interface is network-accessible. Check firewall rules, network segmentation, and whether the HTTPS management port is exposed to untrusted networks or the internet.Affected if The XMS web interface is accessible from networks where untrusted users could potentially craft malicious requests
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Check for CSRF protection mechanismsExamine the XMS web interface for presence of CSRF tokens or protection. This can be done by inspecting HTTP requests/responses from the XMS interface, checking if forms include anti-CSRF tokens, or reviewing XMS security settings.Affected if The web interface lacks CSRF token validation or anti-CSRF protections in state-changing operations
You are affected if Dell XtremIO XMS is running with a version lower than 6.3.3-8 and the web interface is accessible to users who could trigger the CSRF vulnerability.
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 · scoped6.3.3-8
Upgrade to Dell EMC XtremIO version 6.3.3-8 or later, which includes CSRF protection mechanisms in XMS.
6.3.3-8
- 1. Obtain Dell EMC XtremIO Management Server version 6.3.3-8 or later from Dell support portal (support.dell.com)
- 2. Review the Dell XtremIO upgrade documentation for prerequisites
- 3. Schedule a maintenance window considering backup and rollback procedures
- 4. Perform the upgrade following Dell's documented upgrade procedure
- 5. Verify the XMS version shows 6.3.3-8 or later after upgrade
- 6. Validate that the XtremIO Management Server is functioning normally
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-21549 — 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-2021-21549 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
- No spam, self-promotion, credentials, or personal data