Unified Contact Center ExpressApplication · Cisco
CVE-2019-15259
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 Cisco Unified Contact Center Express (UCCX) Software could allow an unauthenticated, remote attacker to conduct an HTTP response splitting attack. The vulnerability is due to insufficient input validation of some parameters that are passed to the web server of the affected system. An attacker could exploit this vulnerability by convincing a user to follow a malicious link or by intercepting a user request on an affected device. A successful exploit could allow the attacker to perform cross-site scripting attacks, web cache poisoning, access sensitive browser-based information, and similar exploits.
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 is an HTTP response splitting vulnerability in Cisco UCCX where insufficient input validation of certain web server parameters allows attackers to inject malicious content into HTTP responses. Successful exploitation enables cross-site scripting, web cache poisoning, and exposure of sensitive browser-based information.
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
< 11.6\(2\)= 12.0\(1\)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 checksWork through these to decide whether this CVE applies to you.
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Identify Cisco UCCX installation and versionAccess the Cisco UCCX server via SSH or console and run the command 'show version' or check the administration interface for the version number. Look for the UCCX version in the output.Affected if The installed version is below 11.6(2) or exactly 12.0(1)
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Confirm web server component is presentCheck if the Cisco UCCX web server component is installed by looking for the UCCX Web Framework or similar web services. On the server, verify the presence of web service directories or check the Cisco UCCX Serviceability page.Affected if The UCCX web server component is installed and running (required for HTTP response splitting to be exploitable)
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Determine web interface accessibilityCheck if the Cisco UCCX administrative web interface is accessible from network locations. Review firewall rules or access control lists that permit HTTP/HTTPS traffic to the UCCX management ports (typically ports 80, 443, 8080, 8443).Affected if The web interface is exposed to network access beyond localhost or trusted admin networks
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Review HTTP logs for response splitting indicatorsExamine Cisco UCCX web server access and error logs (typically found in the UCCX logs directory) for unusual patterns such as multiple header fields, carriage return/line feed (CRLF) sequences in request parameters, or repeated Location headers.Affected if Logs show suspicious HTTP requests containing CRLF injection patterns or unusual header manipulation attempts
You are affected if your Cisco UCCX version is below 11.6(2) or exactly 12.0(1), the web server component is running, and the web interface is network-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 data11.6
Apply the Cisco-provided patch for CVE-2019-15259. As a temporary mitigation, consider implementing a WAF rule to filter malicious input patterns and educate users about not clicking untrusted links.
Fix this in Unified Contact Center Express
Scoped from the published advisory
- Consultation6.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $6,816.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2019-15259 — 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-2019-15259 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
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