{"id":59395,"date":"2025-07-15T08:13:15","date_gmt":"2025-07-15T08:13:15","guid":{"rendered":""},"modified":"2025-09-03T19:03:30","modified_gmt":"2025-09-04T01:03:30","slug":"cve-2025-47981-critical-heap-based-buffer-overflow-vulnerability-in-windows-spnego","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-47981-critical-heap-based-buffer-overflow-vulnerability-in-windows-spnego\/","title":{"rendered":"<strong>CVE-2025-47981: Critical Heap-based Buffer Overflow Vulnerability in Windows SPNEGO<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In the realm of cybersecurity, maintaining the integrity of systems and data is a continuous battle against malicious entities. It is against this backdrop that the Common Vulnerabilities and Exposures (CVE) system plays a crucial role in providing a reference-point for publicly known cybersecurity vulnerabilities. One such vulnerability, identified as CVE-2025-47981, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50160-heap-based-buffer-overflow-in-windows-rras-posing-system-compromise-risk\/\"  data-wpil-monitor-id=\"78438\">poses a significant threat to Windows<\/a> SPNEGO users. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53076-critical-overread-buffers-vulnerability-in-samsung-s-rlottie\/\"  data-wpil-monitor-id=\"66227\">vulnerability is an instance of a heap-based buffer<\/a> overflow, a common exploit that allows attackers to execute malicious code over a network. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47998-severe-heap-based-buffer-overflow-vulnerability-in-windows-routing-and-remote-access-service\/\"  data-wpil-monitor-id=\"67290\">severity of this vulnerability<\/a> is underscored by its CVSS score of 9.8, a near-critical rating that demands immediate attention and mitigation.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-47981<br \/>\nSeverity: Critical (9.8 on CVSS scale)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7837-critical-vulnerability-in-totolink-t6-potentially-leading-to-system-compromise\/\"  data-wpil-monitor-id=\"71048\">Potential system<\/a> compromise and data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-4069023399\" 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>Windows SPNEGO | All <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55010-arbitrary-php-object-instantiation-in-kanboard-prior-to-version-1-2-47\/\"  data-wpil-monitor-id=\"77996\">versions prior<\/a> to patch<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43193-critical-memory-handling-vulnerability-in-macos\/\"  data-wpil-monitor-id=\"71692\">vulnerability lies in the handling<\/a> of SPNEGO (Simple and Protected GSS-API Negotiation Mechanism) by Windows OS. SPNEGO is used in authentication scenarios where an attacker can manipulate the negotiation process. The heap-based <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7596-critical-remote-buffer-overflow-vulnerability-in-tenda-fh1205\/\"  data-wpil-monitor-id=\"66700\">buffer overflow<\/a> occurs when the system attempts to store data in a buffer that surpasses its capacity. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46713-buffer-overflow-vulnerability-in-sandboxie-s-memory-allocation-subsystem\/\"  data-wpil-monitor-id=\"68551\">overflow can overwrite adjacent memory<\/a> locations, leading to erratic program behavior, crashes, and in worse cases, the execution of malicious code. In the context of CVE-2025-47981, an attacker can exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-26074-remote-code-execution-vulnerability-in-orkes-conductor-v3-21-11\/\"  data-wpil-monitor-id=\"66153\">vulnerability over a network to execute arbitrary code<\/a>, potentially compromising the entire system or leading to data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-555987494\" 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>The following is a<br \/>\n<strong>conceptual<\/strong><br \/>\n example of how the vulnerability might be exploited, using a malicious payload in a network request:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/SPNEGO\/negotiate HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/octet-stream\n{ &quot;auth_token&quot;: &quot;OVERFLOWING_BUFFER_TOKEN&quot; }<\/code><\/pre>\n<p>In this example, the &#8220;auth_token&#8221; is crafted to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8168-critical-buffer-overflow-vulnerability-in-d-link-dir-513-1-10\/\"  data-wpil-monitor-id=\"67089\">overflow the buffer<\/a>, potentially overriding adjacent memory and leading to a potential execution of arbitrary code.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>As a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49886-critical-php-local-file-inclusion-vulnerability-in-webgeniuslab-zikzag-core\/\"  data-wpil-monitor-id=\"66152\">critical vulnerability<\/a>, immediate action is required to secure affected systems. The primary mitigation strategy is to apply the vendor-provided patch. Until the patch can be applied, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation to detect and block exploit attempts. Regularly updating systems and maintaining a robust <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7096-critical-vulnerability-in-comodo-internet-security-premium-12-3-4-8162\/\"  data-wpil-monitor-id=\"66699\">security infrastructure can also provide additional protection against such vulnerabilities<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In the realm of cybersecurity, maintaining the integrity of systems and data is a continuous battle against malicious entities. It is against this backdrop that the Common Vulnerabilities and Exposures (CVE) system plays a crucial role in providing a reference-point for publicly known cybersecurity vulnerabilities. One such vulnerability, identified as CVE-2025-47981, poses a significant [&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":[86],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-59395","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft","attack_vector-buffer-overflow"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/59395","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=59395"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/59395\/revisions"}],"predecessor-version":[{"id":70815,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/59395\/revisions\/70815"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=59395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=59395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=59395"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=59395"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=59395"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=59395"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=59395"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=59395"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=59395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}