{"id":58442,"date":"2025-07-08T16:03:49","date_gmt":"2025-07-08T16:03:49","guid":{"rendered":""},"modified":"2025-10-07T18:13:45","modified_gmt":"2025-10-08T00:13:45","slug":"cve-2025-30381-a-critical-out-of-bounds-read-vulnerability-in-microsoft-office-excel","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-30381-a-critical-out-of-bounds-read-vulnerability-in-microsoft-office-excel\/","title":{"rendered":"<strong>CVE-2025-30381: A Critical Out-of-bounds Read Vulnerability in Microsoft Office Excel<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>CVE-2025-30381 is a significant cybersecurity vulnerability that affects Microsoft Office Excel, a widely used spreadsheet program. This vulnerability could allow an unauthorized attacker to execute code locally, potentially leading to system compromise or data leakage. As such, it poses a substantial threat to any organization or individual using affected versions of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47168-use-after-free-vulnerability-in-microsoft-office-word-allowing-unauthorized-code-execution\/\"  data-wpil-monitor-id=\"73078\">Microsoft Office<\/a> Excel. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32281-high-severity-missing-authorization-vulnerability-in-focuxtheme-wpkit-for-elementor\/\"  data-wpil-monitor-id=\"65290\">severity of this vulnerability<\/a> is accentuated by its potential impacts, which range from unauthorized data access to full system compromise.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-30381<br \/>\nSeverity: High &#8211; CVSS Score 7.8<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52717-sql-injection-vulnerability-in-lifterlms-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"65407\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3524419124\" 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: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\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: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\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: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/div>\n<p>Product | Affected Versions<\/p>\n<p><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47170-use-after-free-vulnerability-in-microsoft-office-word\/\"  data-wpil-monitor-id=\"75403\">Microsoft Office<\/a> Excel | All versions prior to the latest patch<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>At its core, CVE-2025-30381 is an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53074-critical-out-of-bounds-read-vulnerability-in-samsung-rlottie-v0-2\/\"  data-wpil-monitor-id=\"65669\">out-of-bounds read vulnerability<\/a>. This means that the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6573-critical-kernel-software-vulnerability-leading-to-potential-data-leakage\/\"  data-wpil-monitor-id=\"80155\">software improperly verifies or handles data<\/a> within its buffer boundaries. In this case, an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-42959-unauthenticated-replay-attack-exploiting-hmac-reuse\/\"  data-wpil-monitor-id=\"73079\">attacker can exploit<\/a> this flaw by tricking a user into opening a specially crafted Excel document that contains malicious code. When the affected software reads beyond the allocated buffer, it can cause the software to crash, potentially <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53002-remote-code-execution-vulnerability-in-llama-factory\/\"  data-wpil-monitor-id=\"65206\">executing the attacker&#8217;s code<\/a> in the process.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2139668701\" 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>Consider the following conceptual Excel <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55730-escaping-vulnerability-in-xwiki-remote-macros-enabling-remote-code-execution\/\"  data-wpil-monitor-id=\"89285\">macro that represents how the vulnerability<\/a> might be exploited. This is a hypothetical example and does not represent an actual exploit:<\/p>\n<pre><code class=\"\" data-line=\"\">Sub MaliciousMacro()\nDim buffer(10) As Integer\nDim counter As Integer\n&#039; Fill the buffer with innocent data\nFor counter = 0 To 10\nbuffer(counter) = counter\nNext counter\n&#039; Overflow the buffer\nFor counter = 0 To 11\nbuffer(counter) = counter &#039; This line causes out-of-bounds read\nNext counter\n&#039; Execute malicious code after the crash\nShell(&quot;malicious_command&quot;)\nEnd Sub<\/code><\/pre>\n<p>This example illustrates how a malicious actor could craft a macro to cause an out-of-bounds read, leading to potential <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5310-remote-code-execution-vulnerability-in-dover-fueling-solutions-progauge-maglink-lx-consoles\/\"  data-wpil-monitor-id=\"65541\">code execution<\/a>. It&#8217;s important to note that this is a conceptual example-actual exploit <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-21165-out-of-bounds-write-vulnerability-in-substance3d-designer-leading-to-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"77438\">code would be more complex and designed<\/a> to evade detection.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>To protect against this vulnerability, it is recommended to apply the latest patches provided by <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47165-critical-use-after-free-vulnerability-in-microsoft-office-excel\/\"  data-wpil-monitor-id=\"77418\">Microsoft for Office<\/a> Excel. As a temporary mitigation, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50738-memos-application-vulnerability-allows-for-unauthorized-user-information-disclosure\/\"  data-wpil-monitor-id=\"73080\">users can employ a Web Application<\/a> Firewall (WAF) or Intrusion Detection System (IDS). These systems can help <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20217-denial-of-service-vulnerability-in-snort-3-detection-engine-of-cisco-secure-firewall-threat-defense-software\/\"  data-wpil-monitor-id=\"77119\">detect and prevent malicious attempts to exploit this vulnerability<\/a>. However, they are not a substitute for applying the necessary patches and ensuring your software is up-to-date.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview CVE-2025-30381 is a significant cybersecurity vulnerability that affects Microsoft Office Excel, a widely used spreadsheet program. This vulnerability could allow an unauthorized attacker to execute code locally, potentially leading to system compromise or data leakage. As such, it poses a substantial threat to any organization or individual using affected versions of Microsoft Office Excel. [&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-58442","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\/58442","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=58442"}],"version-history":[{"count":12,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/58442\/revisions"}],"predecessor-version":[{"id":82121,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/58442\/revisions\/82121"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=58442"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=58442"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=58442"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=58442"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=58442"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=58442"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=58442"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=58442"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=58442"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}