dbcve.org
Unified Contact Center ExpressApplication · Cisco

CVE-2025-20276

HIGH · 7.2 CVSS v3.1 Published 2025-06-04
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
78/100
Remediation priority · High
Remotely reachable Zero-click

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 CCX could allow an authenticated, remote attacker to execute arbitrary code on an affected device. To exploit this vulnerability, the attacker must have valid administrative credentials.  This vulnerability is due to insecure deserialization of Java objects by the affected software. An attacker could exploit this vulnerability by sending a crafted Java object to an affected device. A successful exploit could allow the attacker to execute arbitrary code on the underlying operating system of an affected device as a low-privilege user. A successful exploit could also allow the attacker to undertake further actions to elevate their privileges to root.

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 confidence

CVE-2025-20276 is an insecure deserialization vulnerability in the web-based management interface of Cisco Unified CCX. An authenticated attacker with valid administrative credentials can send a crafted Java object to trigger deserialization, achieving remote code execution initially as a low-privilege user with potential escalation to root.

MitigationApply the Cisco security patch when available; until then, limit administrative access to trusted personnel only, monitor for suspicious administrative sessions, and restrict network access to the management 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
Unified Contact Center ExpressApplication
Affected:= 8.5\(1\)= 9.0\(2\)su3es04= 10.0\(1\)su1= 10.0\(1\)su1es04= 10.5\(1\)= 10.5\(1\)su1= 10.5\(1\)su1es10= 10.6\(1\)= 10.6\(1\)su1= 10.6\(1\)su2= 10.6\(1\)su2es04= 10.6\(1\)su3

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
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/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 checks

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

  1. Confirm Cisco Unified CCX installation
    Locate the Cisco Unified CCX installation on the system or identify it via network inventory. Check for process names such as 'ciscoccx' or 'uccx' running on the host.
    Affected if The product Cisco Unified CCX is present on the network or system.
  2. Identify installed version
    Access the Cisco Unified CCX administrative interface or check the system directly for the installed version. This is typically visible in the 'About' or 'System Information' page of the web-based management console, or can be retrieved via CLI using 'show version' or 'utils system version' commands if SSH access is available.
    Affected if The installed version matches one of the following: 8.5(1), 9.0(2)su3es04, 10.0(1)su1, 10.0(1)su1es04, 10.5(1), 10.5(1)su1, 10.5(1)su1es10, 10.6(1), 10.6(1)su1, 10.6(1)su2, 10.6(1)su2es04, or 10.6(1)su3.
  3. Verify web-based management interface is accessible
    Check if the Cisco Unified CCX web management interface (typically on port 443 or 8443) is exposed and reachable on the network. Confirm the service is running by testing connectivity to the management URL.
    Affected if The web-based management interface is active and reachable.
  4. Assess administrative account accessibility
    Review who has administrative credentials for the Cisco Unified CCX system. Determine if default accounts remain unchanged, if additional administrative users exist beyond those intended, or if the administrative portal is accessible to more users than intended.
    Affected if Administrative credentials exist and the management interface is accessible to authenticate with those credentials.
  5. Review network exposure of management interface
    Determine if the web-based management interface is accessible from untrusted networks or the internet rather than only from trusted management networks or VPN connections.
    Affected if The management interface is exposed to untrusted network segments or the public internet.

A user is affected if Cisco Unified CCX is installed with a version matching the affected list AND the web-based management interface is accessible with administrative credentials.

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 Cisco security patch when available; until then, limit administrative access to trusted personnel only, monitor for suspicious administrative sessions, and restrict network access to the management interface.

Recommended fix Moderate confidence

Contact Cisco TAC for the specific fixed release (advisory typically includes fixed software releases for each affected version)

  1. 1. Contact Cisco TAC or access the Cisco Security Advisory at sec.cloudapps.cisco.com to obtain the specific fixed release for your version of Unified CCX.
  2. 2. Before upgrading, backup all critical configuration data and ensure you have a valid system backup.
  3. 3. Schedule a maintenance window as upgrades to Unified CCX typically require system downtime.
  4. 4. Download the appropriate upgrade package (service update or new release) as specified in the Cisco security advisory.
  5. 5. Follow Cisco's standard upgrade procedure for Unified CCX, which typically involves accessing the platform administration interface and running the upgrade installer.
  6. 6. After upgrade completion, verify the system is functioning correctly and confirm the vulnerability is remediated by checking the software version.
Caveat Upgrade may require downtime and could involve platform updates; ensure compatibility with existing integrations before proceeding

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

Fix this in Unified Contact Center Express Scoped from the published advisory
  • Consultation4.0 h
  • Implementation6.0 h
  • Testing5.0 h
  • Review / QA3.0 h
18.0 hours of engineering $3,170
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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-2025-20276 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