Some intrusion prevention system (IPS) devices may contain an issue that could allow an unauthenticated, remote attacker to bypass security scanning. This issue could allow an attacker to use encoding and decoding techniques to obscure exploit and shell code, preventing IPS devices from detecting and blocking attacks.
Administrators are advised to apply appropriate software updates.
Administrators may consider employing secondary filtering devices until updates are applied.
The security vulnerability applies to the following combinations of products.
Security Activity Bulletin
Original Release (Base)
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Cisco Multivendor Vulnerability Alerts respond to vulnerabilities identified in third-party vendors' products. These alerts contain information compiled from diverse sources and provide comprehensive technical descriptions, objective analytical assessments, workarounds and practical safeguards, and links to vendor advisories and patches.