{"id":81785,"date":"2025-10-05T09:30:56","date_gmt":"2025-10-05T09:30:56","guid":{"rendered":""},"modified":"2025-10-21T14:51:55","modified_gmt":"2025-10-21T20:51:55","slug":"cve-2025-53759-microsoft-office-excel-uninitialized-resource-execution-vulnerability","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-53759-microsoft-office-excel-uninitialized-resource-execution-vulnerability\/","title":{"rendered":"<strong>CVE-2025-53759: Microsoft Office Excel Uninitialized Resource Execution Vulnerability<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>CVE-2025-53759 is a serious vulnerability that affects Microsoft Office Excel, a widely-used spreadsheet software. This flaw allows unauthorized attackers to execute code locally on the victim&#8217;s system, leading to potential system compromise or data leakage. Given the widespread use of Excel in organizations across various sectors, this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52930-high-risk-memory-corruption-vulnerability-in-sail-image-decoding-library\/\"  data-wpil-monitor-id=\"90883\">vulnerability poses a significant risk<\/a>. Its successful exploitation could result in severe business disruption or even financial loss.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-53759<br \/>\nSeverity: High (7.8 CVSS Score)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: Required<br \/>\nImpact: Unauthorized code execution, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9443-buffer-overflow-vulnerability-in-tenda-ch22-1-0-0-1-potentially-leads-to-system-compromise\/\"  data-wpil-monitor-id=\"89042\">potential system<\/a> compromise, or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-333111391\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-54897-deserialization-vulnerability-in-microsoft-office-sharepoint\/\"  data-wpil-monitor-id=\"89213\">Microsoft Office<\/a> Excel | All versions before the patch<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit works by taking advantage of an uninitialized <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-54910-exploiting-heap-based-buffer-overflow-in-microsoft-office\/\"  data-wpil-monitor-id=\"89533\">resource<\/a> within Microsoft Office Excel. An attacker crafts a malicious Excel <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-41714-critical-vulnerability-in-upload-endpoint-causing-arbitrary-file-write-and-potential-remote-code-execution\/\"  data-wpil-monitor-id=\"89524\">file containing specially designed code<\/a>. Once the victim opens this file, the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9712-critical-remote-code-execution-vulnerability-in-ivanti-endpoint-manager\/\"  data-wpil-monitor-id=\"89119\">code is executed<\/a> locally on the victim&#8217;s machine due to the software&#8217;s failure to properly initialize a resource. This allows the attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9872-remote-code-execution-vulnerability-in-ivanti-endpoint-manager-due-to-insufficient-filename-validation\/\"  data-wpil-monitor-id=\"89160\">execute arbitrary code<\/a> or commands in the context of the current user. If the user holds administrative rights, the attacker could take control of the affected system.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1763021012\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>Below is a conceptual example of how an attacker might craft a malicious payload within an Excel file:<\/p>\n<pre><code class=\"\" data-line=\"\">Sub Workbook_Open()\nShell(&quot;cmd.exe \/c [malicious_command]&quot;, vbHide)\nEnd Sub<\/code><\/pre>\n<p>In this example, the `Workbook_Open` subroutine runs when the Excel file is opened, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-59458-jetbrains-junie-code-execution-vulnerability-through-improper-command-validation\/\"  data-wpil-monitor-id=\"89588\">executing the malicious command<\/a> in the Windows command line via the `Shell` function.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>Users are strongly recommended to immediately apply the vendor patch provided by <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9693-arbitrary-file-deletion-vulnerability-in-user-meta-user-profile-builder-plugin-for-wordpress\/\"  data-wpil-monitor-id=\"90631\">Microsoft<\/a> to remediate this vulnerability. As a temporary mitigation, users can also employ a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to detect and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-10533-critical-vulnerability-in-firefox-and-thunderbird-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"89406\">potentially block attempts to exploit this vulnerability<\/a>. However, these measures should not replace the need to apply the vendor patch, which provides a complete fix.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview CVE-2025-53759 is a serious vulnerability that affects Microsoft Office Excel, a widely-used spreadsheet software. This flaw allows unauthorized attackers to execute code locally on the victim&#8217;s system, leading to potential system compromise or data leakage. Given the widespread use of Excel in organizations across various sectors, this vulnerability poses a significant risk. Its successful [&hellip;]<\/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,"footnotes":""},"categories":[1],"tags":[],"vendor":[82],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-81785","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/81785","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=81785"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/81785\/revisions"}],"predecessor-version":[{"id":83829,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/81785\/revisions\/83829"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=81785"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=81785"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=81785"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=81785"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=81785"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=81785"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=81785"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=81785"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=81785"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}