CVE-2021-29107
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 · uneditedA stored Cross Site Scripting (XXS) vulnerability in ArcGIS Server Manager version 10.8.1 and below may allow a remote unauthenticated attacker to pass and store malicious strings in the ArcGIS Server Manager 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 · moderate confidenceA stored Cross-Site Scripting (XSS) vulnerability in ArcGIS Server Manager versions 10.8.1 and below allows remote unauthenticated attackers to inject and persist malicious script content through unsanitized input fields. When other authenticated users access the stored content, the malicious scripts execute in their browsers, potentially enabling session hijacking, credential theft, or defacement.
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= 10.6.1CVSS 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
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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 if ArcGIS Server is installedLocate the ArcGIS Server installation directory, typically found under C:\Program Files\ArcGIS\Server or /opt/arcgis/server, and confirm the Server folder exists. On Windows, also check Services for 'ArcGIS Server' entry.Affected if ArcGIS Server software is present on the system
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Determine the installed ArcGIS Server versionOpen the ArcGIS Server Manager interface by navigating to https://<server>:6443/arcgis/manager in a web browser, or check the version file in the installation directory. The version is typically displayed on the Manager home page or in the 'About' section.Affected if The installed version is 10.8.1 or below, or specifically 10.6.1 as listed in affected versions
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Verify Manager interface accessibilityConfirm the ArcGIS Server Manager web interface is reachable over the network at port 6443 or 6080. Check firewall rules and IIS/web server bindings that expose the Manager URL.Affected if The Manager interface is accessible from the network (internal or external)
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Inspect for existing XSS payloads in ManagerLog into ArcGIS Server Manager and review any user-configurable fields such as service names, site descriptions, or custom settings where input may have been persisted. Check browser developer console for any script execution errors.Affected if Malicious script content is found stored in Manager configuration fields, or unexpected script execution occurs when accessing Manager pages
A system is affected if ArcGIS Server version 10.8.1 or below (including 10.6.1) is installed with the Manager interface accessible, and malicious scripts have been injected into stored input fields.
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 the vendor patch for CVE-2021-29107 or upgrade ArcGIS Server to a version beyond 10.8.1; implement output encoding and input validation on all user-supplied data in the Manager interface as a defense-in-depth measure until patching is complete.
- Consultation3.0 h
- Implementation6.0 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-2021-29107 — 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-2021-29107 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