Unified Communications ManagerApplication · Cisco
CVE-2021-1380
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 · uneditedMultiple vulnerabilities in the web-based management interface of Cisco Unified Communications Manager (Unified CM), Cisco Unified Communications Manager IM & Presence Service (Unified CM IM&P), Cisco Unified Communications Manager Session Management Edition (Unified CM SME), and Cisco Unity Connection could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against an interface user. These vulnerabilities exist because the web-based management interface does not properly validate user-supplied input. An attacker could exploit these vulnerabilities by persuading an interface user to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected 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 confidenceThis CVE describes multiple stored and reflected XSS vulnerabilities in the web-based management interfaces of Cisco's unified communications products (Unified CM, Unified CM IM&P, Unified CM SME, and Unity Connection). The vulnerabilities stem from improper input validation in the web interface, allowing attackers to inject malicious scripts via crafted links that execute in the context of the user's browser session, potentially stealing session cookies or performing actions on behalf of the authenticated user.
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
Unified Communications ManagerApplication
< 14
Unified Communications Manager Im \& Presence ServiceApplication
< 14
Unity ConnectionApplication
< 14.0CVSS 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 installed Cisco unified communications productsReview system inventory or run package queries to list installed Cisco UC products such as Unified Communications Manager (Unified CM), Unified CM IM & Presence Service, or Unity Connection.Affected if Any of these products are installed on the system.
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Check installed product versionLocate the version information for the installed Cisco UC product via its administrative interface, command-line tool, or product-specific registry/file. Compare the version number against the affected ranges: Unified CM and Unified CM IM&P versions below 14, Unity Connection versions below 14.0.Affected if The installed version is below 14 (for Unified CM and Unified CM IM&P) or below 14.0 (for Unity Connection).
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Determine if web management interface is enabledAccess the product's service configuration or OS administration panel to verify whether the web-based management interface (HTTPS/HTTP) is currently enabled and listening.Affected if The web management interface is enabled and accessible.
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Check network exposure of management interfaceReview firewall rules, network access lists, or listening service configurations to determine if the web management interface is exposed to the network or only bound to localhost/internal interfaces.Affected if The web management interface is reachable from network segments beyond trusted administrative networks.
Your environment is affected if any of these Cisco UC products are installed with a version below 14 (or 14.0 for Unity Connection) and the web-based management interface is enabled and accessible.
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 data1414.0
Apply the relevant Cisco security patches for this CVE to affected product versions; users should also be educated about not clicking untrusted links, though patching is the primary remediation.
Fix this in Unified Communications Manager
Scoped from the published advisory
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 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 $5,600.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-1380 — 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-2021-1380 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