A heap buffer out-of-bounds read vulnerability in the Avira Antivirus engine could allow an attacker to execute code locally or crash the security software.

This is a heap buffer out-of-bounds read vulnerability triggered when the Avira scan engine processes a specially crafted, malformed PDF file. An attacker can leverage this to trigger a Denial of Service (DoS) of the antivirus engine or, under specific conditions, achieve local execution of code.

With a CVSS score of 7.8, this vulnerability is considered a high-risk issue. Because the vulnerability exists within the antivirus engine itself, a successful exploit could disable security protections on the host system, leaving it vulnerable to other threats, or lead to unauthorized code execution with the privileges of the scanning process.

Immediate Action: Update the Avira scan engine to build 8.3.70.68 or later immediately.

Proactive Monitoring: Review antivirus logs for engine crashes or errors during file scanning processes, which may indicate an attempt to exploit this flaw.

Compensating Controls: Employ secondary endpoint detection and response (EDR) solutions to monitor for suspicious process execution patterns originating from the antivirus engine.

Public Exploit Available: false

Security teams should ensure that all Avira Antivirus installations are updated to the latest engine build. Failure to patch allows for a bypass of security controls, significantly increasing the risk of subsequent malicious activity on the endpoint.