dbcve.org
Unified Communications ManagerApplication · Cisco

CVE-2024-20511

MEDIUM · 6.1 CVSS v3.1 Published 2024-11-06
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
68/100
Remediation priority · Elevated
Remotely reachable No privileges

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 · unedited
A vulnerability in the web-based management interface of Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the interface. This vulnerability exists because the web-based management interface does not properly validate user-supplied input. An attacker could exploit this vulnerability by persuading a user of the interface 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 confidence

A reflected XSS vulnerability exists in the web-based management interface of Cisco Unified Communications Manager and Unified CM SME due to improper input validation. An unauthenticated attacker can craft malicious links that, when clicked by an authenticated user, execute arbitrary JavaScript in the user's browser context, potentially stealing session cookies or performing actions on behalf of the user.

MitigationApply the vendor patch from Cisco when available. Until then, restrict access to the web management interface to trusted networks only and educate users about not clicking suspicious links.

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
Affected:= 12.0\(1\)su1= 12.0\(1\)su2= 12.0\(1\)su3= 12.0\(1\)su4= 12.0\(1\)su5= 12.5\(1\)= 12.5\(1\)su1= 12.5\(1\)su2= 12.5\(1\)su3= 12.5\(1\)su4= 12.5\(1\)su5= 12.5\(1\)su6

CVSS 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 checks

Work through these to decide whether this CVE applies to you.

  1. Determine installed Cisco Unified Communications Manager version
    Log into the server CLI and run the command 'show version' or access the web interface and navigate to the About page to view the version information
    Affected if The displayed version matches or falls within the affected ranges: 12.0(1)su1 through 12.0(1)su5, or 12.5(1) through 12.5(1)su6
  2. Confirm the specific SU (Service Update) patch level
    In the CLI output or web About page, locate the full version string which includes the SU number (for example, 12.5(1)su2)
    Affected if The version string shows exactly: 12.0(1)su1, 12.0(1)su2, 12.0(1)su3, 12.0(1)su4, 12.0(1)su5, 12.5(1), 12.5(1)su1, 12.5(1)su2, 12.5(1)su3, 12.5(1)su4, 12.5(1)su5, or 12.5(1)su6
  3. Verify web-based management interface is enabled
    Check if the HTTP/HTTPS management interface is active by attempting to access the web UI URL or by reviewing server network listening ports
    Affected if The web management interface is accessible and the installed version matches the affected versions list

You are affected if your Cisco Unified Communications Manager version is exactly one of the listed vulnerable versions (12.0(1)su1-su5 or 12.5(1)su1-su6) and the web-based management interface is accessible.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 · scoped
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Apply the vendor patch from Cisco when available. Until then, restrict access to the web management interface to trusted networks only and educate users about not clicking suspicious links.

Recommended fix Moderate confidence

Apply the fixed Unified CM release as specified in the Cisco security advisory for CVE-2024-20511 (check sec.cloudapps.cisco.com or cisco.com/go/ipsg for the exact version number)

  1. 1. Check the Cisco Security Advisory (cisco.com/go/ipsg) for CVE-2024-20511 to obtain the specific fixed release version
  2. 2. Navigate to the Cisco Software Downloads page and locate Cisco Unified Communications Manager
  3. 3. Download the fixed version as identified in the security advisory
  4. 4. Review the upgrade guide for Unified CM at the provided reference source
  5. 5. Schedule a maintenance window and perform a full backup of the current system
  6. 6. Follow the standard upgrade procedure for Unified CM, applying the fixed release
  7. 7. After upgrade, verify the system is operational and test that the XSS vulnerability is remediated
Caveat Review Cisco release notes for any configuration or feature changes between your current SU version and the fixed release

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Unified Communications Manager Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-20511 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • 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