CVE-2025-64899 is an out-of-bounds read vulnerability classified under CWE-125, affecting Adobe Acrobat Reader versions 20.005.30793, 20.005.30803, 24.001.30264, 24.001.30273, 25.001.20982, and earlier. The vulnerability arises during the parsing of a maliciously crafted PDF file, where the software reads beyond the end of an allocated memory buffer. This memory corruption can lead to arbitrary code execution within the context of the current user. The attack vector requires that the victim opens a malicious PDF document, making user interaction mandatory. The vulnerability does not require elevated privileges or prior authentication, increasing its risk profile. The CVSS v3.1 base score of 7.8 reflects a high severity due to the potential for complete compromise of confidentiality, integrity, and availability of the affected system. Although no public exploits have been reported yet, the nature of the vulnerability and Adobe Acrobat Reader's widespread use make it a significant threat. The absence of patches at the time of disclosure necessitates immediate risk mitigation. The vulnerability could be leveraged in targeted attacks or widespread phishing campaigns using weaponized PDF files.

If exploited, this vulnerability allows attackers to execute arbitrary code with the privileges of the current user, potentially leading to full system compromise depending on user rights. Confidential data could be exposed or altered, and system availability could be disrupted. Since Acrobat Reader is widely used in enterprises and government agencies worldwide, successful exploitation could facilitate espionage, data theft, ransomware deployment, or lateral movement within networks. The requirement for user interaction limits mass exploitation but does not eliminate risk, especially in environments where users frequently open PDF attachments from untrusted sources. The lack of patches increases the window of exposure. Organizations with high-value intellectual property or sensitive data are at particular risk, as attackers may craft targeted PDF files to exploit this vulnerability. The impact extends across all platforms where affected Acrobat Reader versions are deployed, including Windows and potentially macOS environments.

Organizations should immediately implement the following mitigations: 1) Educate users to avoid opening PDF files from untrusted or unexpected sources, especially email attachments. 2) Employ email filtering and sandboxing solutions to detect and block malicious PDF files before reaching end users. 3) Use application whitelisting and endpoint protection tools capable of detecting anomalous behavior related to Acrobat Reader. 4) Restrict user privileges to the minimum necessary to reduce the impact of code execution under user context. 5) Monitor for unusual process activity or network connections originating from Acrobat Reader processes. 6) Stay alert for Adobe security advisories and apply official patches promptly once released. 7) Consider deploying PDF readers with enhanced security features or sandboxing capabilities as an alternative until patches are available. 8) Implement network segmentation to limit lateral movement if a compromise occurs. These targeted measures go beyond generic advice by focusing on user behavior, detection, and containment strategies specific to this vulnerability's exploitation vector.