Security readout for executives and security teams
Plain-English summary
Cisco Unified Contact Center Express had an input validation flaw that could let a remote attacker manipulate HTTP responses if a user follows a malicious link or a request is intercepted. Business impact is mainly browser-side compromise risk, including cross-site scripting, cache poisoning, and exposure of sensitive browser-based information.
Executive priority
Treat as a moderate-priority remediation item. It is not reported as actively exploited here, but successful abuse could affect users interacting with a trusted contact-center platform.
Technical view
CVE-2019-15259 is a CWE-113 HTTP response splitting issue in Cisco UCCX web server parameter handling. CVSS 3.0 is 6.1: network reachable, low complexity, no privileges, user interaction required, changed scope, low confidentiality and integrity impact, no availability impact.
Likely exposure
Exposure is limited to organizations running Cisco Unified Contact Center Express. The source bundle does not specify affected versions, deployment conditions, or whether internet-facing instances are required.
Exploitation context
The source bundle says exploitation requires convincing a user to follow a malicious link or intercepting a user request. CISA KEV status is false, and no provided source states active exploitation.
Researcher notes
Evidence supports HTTP response splitting in UCCX due to insufficient parameter validation. The bundle lacks fixed-version details, vulnerable version ranges, and exploit prevalence. Avoid assuming affected builds beyond Cisco UCCX until the vendor advisory is reviewed.
Mitigation direction
- Identify Cisco Unified Contact Center Express deployments and owners.
- Review Cisco advisory cisco-sa-20191002-uccx-http for affected and fixed release details.
- Prioritize remediation for externally accessible or high-trust UCCX web interfaces.
- Monitor browser-side security telemetry for XSS or cache poisoning indicators.
Validation and detection
- Confirm whether Cisco UCCX is present in the environment.
- Map deployed UCCX versions against Cisco’s advisory guidance.
- Check whether UCCX web interfaces are reachable by untrusted users.
- Review logs for suspicious links, redirects, or abnormal response header behavior.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CWE-113: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2019-15259 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.1 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N2.82.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.1MediumVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- 20191002 Cisco Unified Contact Center Express HTTP Response Splitting VulnerabilityCVE reference · vendor-advisory, x_refsource_CISCO
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.