CVE-2015-8597: Bluecoat Advanced Secure Gateway

High severity, CVSS 7.4. EPSS: 1.9% chance of exploitation in the next 30 days.

Open redirect vulnerability in Blue Coat ProxySG 6.5 before 6.5.8.8 and 6.6 and Advanced Secure Gateway (ASG) 6.6 might allow remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a base64-encoded URL in conjunction with a "clear text" one in a coaching page, as demonstrated by "http://www.%humbug-URL%.local/bluecoat-splash-API?%BASE64-URL%."

Affected products

  • Bluecoat Advanced Secure Gateway: version 6.6 only
  • Bluecoat Proxysg: up to and including 6.5.8.7

Published 2016-01-08. Last modified 2026-06-17.