CVE-2025-53732 in Office
Summary
by MITRE • 08/12/2025
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
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Analysis
by VulDB Data Team • 09/10/2025
The heap-based buffer overflow vulnerability identified as CVE-2025-53732 represents a critical security flaw within Microsoft Office applications that enables remote code execution through local exploitation. This vulnerability resides in the memory management mechanisms of Office software, specifically affecting how the application handles heap allocation and data processing. The flaw manifests when Office applications process certain file formats or data structures that trigger improper memory handling, creating conditions where attacker-controlled data can overwrite adjacent heap memory regions. Such memory corruption vulnerabilities are particularly dangerous because they can be exploited to overwrite critical program execution pointers, function return addresses, or other control data structures that govern program flow.
The technical implementation of this heap overflow vulnerability follows established patterns commonly found in software security flaws classified under CWE-121, which deals with stack-based buffer overflow conditions. However, this specific instance operates within heap memory spaces rather than stack memory, making it more complex to detect and exploit. The vulnerability typically occurs when Office applications fail to properly validate input data lengths before copying data into heap-allocated buffers. Attackers can craft malicious files or data sequences that, when processed by vulnerable Office applications, cause the application to write beyond the bounds of allocated heap memory. This memory corruption can be leveraged to redirect program execution flow, potentially allowing attackers to execute arbitrary code with the privileges of the affected user account.
The operational impact of CVE-2025-53732 extends beyond simple local privilege escalation scenarios, as it can be weaponized through various attack vectors including malicious email attachments, compromised documents, or even drive-by downloads from compromised websites. The vulnerability's exploitation requires minimal user interaction, often just opening a malicious document, making it particularly dangerous in enterprise environments where users frequently handle documents from external sources. Security researchers have identified this flaw as aligning with ATT&CK technique T1059.001, which covers command and scripting interpreter usage, as successful exploitation typically involves executing shellcode or malicious payloads through compromised Office processes. The vulnerability affects multiple Microsoft Office applications including Word, Excel, and PowerPoint, creating a broad attack surface that increases the probability of successful exploitation.
Organizations should implement comprehensive mitigation strategies immediately upon awareness of this vulnerability, including applying Microsoft's security patches and updates as soon as they become available. Network segmentation and user access controls can help limit potential damage from successful exploitation attempts, while endpoint detection and response solutions should be configured to monitor for anomalous heap memory operations and suspicious process behaviors. The vulnerability's classification under CWE-787, which addresses out-of-bounds write conditions, indicates that defensive measures should focus on memory safety improvements and input validation mechanisms. Additionally, security teams should consider implementing application whitelisting policies to restrict execution of unauthorized code and establish monitoring protocols that can detect potential exploitation attempts through abnormal memory allocation patterns or unexpected program behavior that may indicate heap corruption events.