Sd Wan VmanageApplication · Cisco
CVE-2021-1507
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 vulnerability in an API of Cisco SD-WAN vManage Software could allow an authenticated, remote attacker to conduct a stored cross-site scripting (XSS) attack against users of the application web-based interface. This vulnerability exists because the API does not properly validate user-supplied input. An attacker could exploit this vulnerability by sending malicious input to the API. A successful exploit could allow the attacker to execute arbitrary script code in the context of the web-based interface or access sensitive, browser-based information.
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 stored XSS vulnerability exists in the Cisco SD-WAN vManage Software API. The vulnerability stems from insufficient input validation on user-supplied data submitted through the API, allowing an authenticated attacker to inject malicious scripts that persist in the application and execute in the context of other users' browser sessions when viewing the web interface.
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
Sd Wan VmanageApplication
< 20.5.1CVSS 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
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/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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Confirm Cisco vManage is deployedIdentify any Cisco SD-WAN vManage instances in your environment by reviewing installed software, network services, or documentationAffected if Cisco SD-WAN vManage software is present
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Check installed vManage versionAccess the vManage admin interface or use the command line interface to retrieve the software version number. Compare it against the affected range: any version prior to 20.5.1 is vulnerableAffected if Installed version is lower than 20.5.1
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Verify API access is enabledCheck vManage configuration settings to determine if the REST API is enabled and accessible. Review network access controls and authentication settings for API endpointsAffected if API is enabled and exposed to users or attackers
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Inspect stored API data for suspicious scriptsReview data stored through vManage API endpoints (such as device configurations, templates, or user inputs) for any HTML or JavaScript code that was not properly sanitized. Use database queries or API inspection tools to examine stored valuesAffected if Stored data contains unsanitized script tags or malicious JavaScript
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Review API request logs for XSS injection attemptsExamine vManage API access logs and audit trails for incoming requests containing script tags, javascript: URIs, or other XSS vectors in API input fieldsAffected if Logs show injection attempts or malicious payloads in API calls
You are affected if Cisco SD-WAN vManage is running and the installed version is below 20.5.1 with the API functionality enabled and unsanitized script content present in stored data.
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 data20.5.1
Implement proper input validation and output encoding on all API endpoints, sanitizing any user-supplied data before storage and before rendering in the web interface.
Fix this in Sd Wan Vmanage
Scoped from the published advisory
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-1507 — 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-2021-1507 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
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