This critical heap-based buffer overflow vulnerability in Adobe Acrobat and Reader is confirmed to be actively exploited in the wild, posing an immediate risk of arbitrary code execution.

This is a heap-based buffer overflow vulnerability triggered by parsing malicious PDF files. The attack vector is network-based (unauthenticated), requiring user interaction to open the crafted file.

The vulnerability carries a CVSS score of 9.5, indicating a critical severity level. Successful exploitation allows for arbitrary code execution, which can lead to full system compromise, malware installation, and unauthorized data exfiltration. Given its inclusion in the CISA KEV catalog, the urgency for remediation is extreme.

Immediate Action: Update Adobe Acrobat and Reader to version 7.1.4, 8.1.7, 9.2, or later as specified in the vendor security bulletin APSB09-15.

Proactive Monitoring: Monitor endpoint logs for suspicious child processes spawned by Acrobat or Reader and scan for unauthorized network connections originating from document-viewing applications.

Compensating Controls: Deploy endpoint protection solutions that can detect and block known exploit patterns associated with memory corruption in PDF parsers.

Public Exploit Available: Yes — a Metasploit module and ExploitDB entries exist.

Due to the confirmed active exploitation and critical severity, organizations must prioritize patching all instances of Acrobat and Reader. If patching is not immediately feasible, restrict the ability of these applications to access the internet and implement strict email filtering to block malicious PDF attachments.