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CVE-2017-3823 Cisco CVE debrief

CVE-2017-3823 is a high-severity remote code execution issue in several Cisco WebEx browser extensions and plugins on Microsoft Windows. A successful attack requires user interaction, but an unauthenticated remote attacker could trigger code execution with the privileges of the affected browser by luring the user to an attacker-controlled page or link.

Vendor
Cisco
Product
CVE-2017-3823
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2017-02-01
Original CVE updated
2026-05-13
Advisory published
2017-02-01
Advisory updated
2026-05-13

Who should care

Organizations still using Cisco WebEx browser extensions or legacy WebEx Meetings Server / WebEx Centers components on Windows should care, especially if users browse with Chrome, Firefox, or Internet Explorer and have the affected plugins installed.

Technical summary

The issue is described as a design defect in an API response parser within the extension. The NVD record maps the flaw to CWE-119 and lists affected components including Cisco WebEx before 1.0.7 on Chrome, ActiveTouch General Plugin Container before 106 on Firefox, GpcContainer Class ActiveX control before 10031.6.2017.0126 on Internet Explorer, and Download Manager ActiveX control before 2.1.0.10 on Internet Explorer. The impact is arbitrary code execution with the privileges of the affected browser on Windows.

Defensive priority

High priority for any Windows environment that still depends on these WebEx browser extensions. Although user interaction is required, the impact is full code execution in the browser context, and the affected software is legacy enough that exposure should be treated as urgent.

Recommended defensive actions

  • Update Cisco WebEx browser extensions and plugins to the fixed versions identified in the advisory and NVD record, including WebEx 1.0.7, ActiveTouch General Plugin Container 106, GpcContainer Class ActiveX control 10031
  • Audit Windows endpoints for installed WebEx browser extensions and remove or disable obsolete components that are no longer needed.
  • Review Cisco WebEx Meetings Server and WebEx Centers deployments to confirm patched versions are in use across all supported browsers.
  • Restrict exposure from untrusted links and web content where feasible, and monitor for unexpected browser or plugin crashes or anomalous behavior.
  • Follow Cisco's vendor advisory guidance for environment-specific remediation and validation.

Evidence notes

This debrief is based on the supplied NVD record and Cisco advisory references. The supplied source describes the issue, affected browsers/components, version thresholds, Windows scope, attacker precondition (user visits attacker-controlled content or follows a malicious link), and impact. No exploit details beyond that description are included.

Official resources

CVE published on 2017-02-01. The supplied enrichment data does not indicate Known Exploited Vulnerabilities listing or ransomware-campaign association.