CVE-2017-3813: Cisco AnyConnect Secure Mobility Client

High severity, CVSS 7.8. EPSS: 1.7% chance of exploitation in the next 30 days.

A vulnerability in the Start Before Logon (SBL) module of Cisco AnyConnect Secure Mobility Client Software for Windows could allow an unauthenticated, local attacker to open Internet Explorer with the privileges of the SYSTEM user. The vulnerability is due to insufficient implementation of the access controls. An attacker could exploit this vulnerability by opening the Internet Explorer browser. An exploit could allow the attacker to use Internet Explorer with the privileges of the SYSTEM user. This may allow the attacker to execute privileged commands on the targeted system. This vulnerability affects versions prior to released versions 4.4.00243 and later and 4.3.05017 and later. Cisco Bug IDs: CSCvc43976.

Affected products

• Cisco AnyConnect Secure Mobility Client: version 4.0.00048 only; version 4.0.00051 only; version 4.0.00052 only; version 4.0.00057 only; version 4.0.00061 only; version 4.1.00028 only; …

Published 2017-02-09. Last modified 2026-06-17.