{"id":81732,"date":"2025-10-05T03:30:23","date_gmt":"2025-10-05T03:30:23","guid":{"rendered":""},"modified":"2025-10-21T14:51:46","modified_gmt":"2025-10-21T20:51:46","slug":"cve-2025-53741-heap-based-buffer-overflow-vulnerability-in-microsoft-office-excel","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-53741-heap-based-buffer-overflow-vulnerability-in-microsoft-office-excel\/","title":{"rendered":"CVE-2025-53741: Heap-Based Buffer Overflow Vulnerability in Microsoft Office Excel<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The cybersecurity world is witnessing a new vulnerability that affects Microsoft Office Excel. Identified as CVE-2025-53741, this vulnerability is a heap-based buffer overflow that allows an unauthorized attacker to execute code locally. Given the wide usage of Excel across organizations worldwide, this vulnerability poses a significant risk<\/a>. Buffer overflow vulnerabilities<\/a> are not new, but their impact can be severe due to the potential for system compromise or data leakage.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-53741
\nSeverity: High (CVSS 7.8)
\nAttack Vector: Local
\nPrivileges Required: None
\nUser Interaction: Required
\nImpact: System compromise or data<\/a> leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Microsoft Office<\/a> Excel | All versions prior to the latest patch<\/p>\n

How the Exploit Works<\/strong><\/p>\n

A heap-based buffer overflow is a type of vulnerability<\/a> which occurs when data written to a buffer exceeds its capacity, and overflows onto the adjacent memory, causing it to overwrite other data. In the case of CVE-2025-53741, an attacker can exploit Excel’s failure to properly allocate and monitor the size of objects or data in memory. By sending a specially crafted file to the victim and tricking them into opening it with Excel, the attacker can execute arbitrary code<\/a> in the context of the current user.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Here is a conceptual example of how this vulnerability might be exploited. This is not actual code but an illustrative scenario to show how an attacker might take advantage of the buffer overflow<\/a>:<\/p>\n

# An attacker creates a specially crafted Excel file with oversized cells\nmalicious_file = create_excel_file_with_oversized_cells()\n# This file is then sent to the victim, who opens it with Excel\nopen_excel_file(malicious_file)\n# The oversized cells cause a buffer overflow, allowing the attacker to execute code\nexecute_code(malicious_file)<\/code><\/pre>\n
Mitigation Guidance<\/strong><\/p>\n
It is strongly recommended that users and administrators apply the vendor patch as soon as possible. In the absence of a patch, a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as temporary mitigation. However, these measures can only detect and possibly block known exploits and may not protect against new or unknown ones. Therefore, applying the vendor patch remains the most effective solution to this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The cybersecurity world is witnessing a new vulnerability that affects Microsoft Office Excel. Identified as CVE-2025-53741, this vulnerability is a heap-based buffer overflow that allows an unauthorized attacker to execute code locally. Given the wide usage of Excel across organizations worldwide, this vulnerability poses a significant risk. Buffer overflow vulnerabilities are not new, but […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[82],"product":[],"attack_vector":[86],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-81732","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft","attack_vector-buffer-overflow"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t