CVE-2025-53741 in Excel
Summary
by MITRE • 08/12/2025
Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
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Analysis
by VulDB Data Team • 08/16/2025
The heap-based buffer overflow vulnerability identified as CVE-2025-53741 resides within Microsoft Office Excel software, representing a critical security flaw that enables remote code execution under specific conditions. This vulnerability specifically affects the heap memory management mechanisms within Excel's processing capabilities, creating a potential entry point for malicious actors to compromise systems. The flaw manifests when Excel processes certain malformed or specially crafted spreadsheet files, triggering memory corruption that can be exploited to gain unauthorized access to affected systems. The vulnerability is particularly concerning because it operates within the context of a widely deployed productivity application, making it an attractive target for cyber adversaries seeking to establish persistent access to enterprise environments.
The technical implementation of this buffer overflow occurs through improper bounds checking during heap memory allocation and manipulation processes within Excel's spreadsheet rendering engine. When processing maliciously crafted data structures, the application fails to validate input parameters adequately, allowing attackers to write beyond allocated memory boundaries in the heap region. This memory corruption can overwrite critical program execution data, including function pointers or return addresses, enabling attackers to redirect program flow to malicious code. The vulnerability demonstrates characteristics consistent with CWE-121 heap-based buffer overflow, where insufficient input validation leads to memory corruption that can be leveraged for privilege escalation and arbitrary code execution. The flaw operates at a low level within the application's memory management subsystem, making detection and prevention particularly challenging for traditional security measures.
The operational impact of CVE-2025-53741 extends beyond simple code execution, as it represents a complete compromise of system integrity and confidentiality. An attacker who successfully exploits this vulnerability can execute malicious code with the privileges of the targeted user, potentially escalating to SYSTEM level access depending on the environment configuration. The vulnerability can be triggered through various attack vectors including email attachments, malicious documents shared via collaboration platforms, or compromised websites that deliver malicious Excel files. Once exploited, the attacker gains the ability to install additional malware, steal sensitive data, establish persistence mechanisms, and potentially move laterally within network environments. This vulnerability directly maps to ATT&CK technique T1059.005 for command and scripting interpreter, and T1068 for exploit for privilege escalation, providing attackers with comprehensive post-exploitation capabilities.
Mitigation strategies for CVE-2025-53741 should implement multiple layers of defense to protect against exploitation attempts. Organizations must prioritize immediate deployment of Microsoft security patches and updates to address the root cause of the vulnerability. Additionally, implementing strict file validation policies, disabling unnecessary Office features, and employing sandboxing technologies can significantly reduce exploitation risk. Network-based protections such as email filtering, web application firewalls, and intrusion detection systems should be configured to monitor for suspicious file types and behaviors associated with this vulnerability. Security teams should also implement user education programs to reduce the likelihood of successful social engineering attacks that could deliver malicious Excel files. The vulnerability's classification as a heap-based buffer overflow aligns with security best practices outlined in the OWASP Top Ten and NIST cybersecurity frameworks, emphasizing the need for robust memory safety controls and comprehensive vulnerability management programs. Organizations should also consider implementing endpoint detection and response solutions that can identify anomalous memory access patterns and potential exploitation attempts.