CVE-2010-1576: Cisco Ace 4710

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

The Cisco Content Services Switch (CSS) 11500 with software before 8.20.4.02 and the Application Control Engine (ACE) 4710 with software before A2(3.0) do not properly handle use of LF, CR, and LFCR as alternatives to the standard CRLF sequence between HTTP headers, which allows remote attackers to bypass intended header insertions or conduct HTTP request smuggling attacks via crafted header data, as demonstrated by LF characters preceding ClientCert-Subject and ClientCert-Subject-CN headers, aka Bug ID CSCta04885.

Affected products

• Cisco Ace 4710: up to and including a3\(2.5\); version a1(2.0) only; version a1(8.0) only
• Cisco Content Services Switch 11500: up to and including 8.20.3.03; version 8.20.0.01 only; version 08.20.1.01 only; version 8.20.1.01 only; version 8.20.2.01 only

Published 2010-07-06. Last modified 2026-06-16.