{"id":80536,"date":"2025-10-02T08:36:18","date_gmt":"2025-10-02T08:36:18","guid":{"rendered":""},"modified":"2025-10-28T22:21:40","modified_gmt":"2025-10-29T04:21:40","slug":"cve-2025-53723-numeric-truncation-error-in-windows-hyper-v-leading-to-privilege-escalation","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-53723-numeric-truncation-error-in-windows-hyper-v-leading-to-privilege-escalation\/","title":{"rendered":"<strong>CVE-2025-53723: Numeric Truncation Error in Windows Hyper-V Leading to Privilege Escalation<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>We are entering an era where cybersecurity is not just about protecting systems from external threats, but also about managing and mitigating internal vulnerabilities. One such vulnerability that poses a significant risk to many organizations is CVE-2025-53723, a numeric truncation error in Windows Hyper-V that allows an authorized attacker to elevate privileges locally. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-36855-buffer-over-read-vulnerability-in-diasymreader-dll-affecting-eol-asp-net-versions\/\"  data-wpil-monitor-id=\"88158\">vulnerability affects<\/a> anyone running vulnerable versions of Windows Hyper-V, a popular virtualization software. It is a prime example of how seemingly minor software bugs can have significant security implications, potentially <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-36890-critical-elevation-of-privilege-vulnerability-may-lead-to-system-compromise\/\"  data-wpil-monitor-id=\"87813\">leading to system<\/a> compromise or data leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-53723<br \/>\nSeverity: High (7.8 CVSS Score)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-36904-critical-privilege-escalation-vulnerability-in-wlan-of-google-pixel-devices\/\"  data-wpil-monitor-id=\"87755\">Privilege escalation<\/a>, potential system compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1278946754\" 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 Hyper-V | All versions up to 2025<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The numeric truncation error in Windows <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32706-windows-common-log-file-system-driver-privilege-elevation-vulnerability\/\"  data-wpil-monitor-id=\"91736\">Hyper-V<\/a> allows an authorized user to input a number that exceeds the system&#8217;s capacity. The system then truncates this number, leading to an error state. An attacker can leverage this state to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-36896-elevation-of-privilege-vulnerability-in-wlan-on-android-devices\/\"  data-wpil-monitor-id=\"87748\">elevate their privileges<\/a> within the system, potentially giving them unrestricted access to sensitive information and system controls. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-0078-selinux-bypass-exploitation-leads-to-local-privilege-escalation\/\"  data-wpil-monitor-id=\"88878\">exploit requires local<\/a> access, meaning an attacker would need to have some level of authorization on the system.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2088323867\" 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>As this is a local exploit, it could be <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-58370-command-execution-vulnerability-in-roo-code-ai-coding-agent\/\"  data-wpil-monitor-id=\"87769\">executed through a command<\/a> line interface on the target system. The following is a conceptual example of how the vulnerability might be exploited:<\/p>\n<pre><code class=\"\" data-line=\"\"># This is a conceptual example and not actual exploit code\n$ sysctl -w kernel.hyperv.truncate_limit=1000000000000\n$ echo &quot;1000000000001&quot; &gt; \/proc\/hyperv\/trigger_truncate<\/code><\/pre>\n<p>In this example, the attacker is setting a kernel parameter to a value that exceeds the system&#8217;s capacity, triggering the numeric truncation error. This could <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55743-serious-vulnerability-in-unopim-allows-potential-system-compromise\/\"  data-wpil-monitor-id=\"89707\">potentially allow<\/a> the attacker to elevate their privileges.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>To mitigate this vulnerability, users are recommended to apply the vendor patch as soon as possible. This patch corrects the numeric truncation error, preventing attackers from exploiting it. In the meantime, users can also use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as temporary mitigation. These tools can detect and block potential exploit attempts. However, they should not be relied upon as a long-term solution, as they do not address the underlying vulnerability.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview We are entering an era where cybersecurity is not just about protecting systems from external threats, but also about managing and mitigating internal vulnerabilities. One such vulnerability that poses a significant risk to many organizations is CVE-2025-53723, a numeric truncation error in Windows Hyper-V that allows an authorized attacker to elevate privileges locally. This [&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":[88,82],"product":[95],"attack_vector":[76],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-80536","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-linux","vendor-microsoft","product-linux-kernel","attack_vector-privilege-escalation"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/80536","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=80536"}],"version-history":[{"count":8,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/80536\/revisions"}],"predecessor-version":[{"id":84908,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/80536\/revisions\/84908"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=80536"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=80536"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=80536"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=80536"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=80536"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=80536"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=80536"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=80536"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=80536"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}