{"id":78663,"date":"2025-09-27T22:37:40","date_gmt":"2025-09-27T22:37:40","guid":{"rendered":""},"modified":"2025-10-15T01:28:42","modified_gmt":"2025-10-15T07:28:42","slug":"cve-2025-21455-critical-memory-corruption-vulnerability-potentially-leads-to-system-compromise","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-21455-critical-memory-corruption-vulnerability-potentially-leads-to-system-compromise\/","title":{"rendered":"<strong>CVE-2025-21455: Critical Memory Corruption Vulnerability Potentially Leads to System Compromise<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>CVE-2025-21455 is a critical vulnerability that affects numerous systems and can potentially lead to severe impacts such as system compromise and data leakage. It involves memory corruption while submitting blob data to the kernel space through IOCTL. This vulnerability is particularly concerning because of its ability to expose sensitive data and provide an attacker with unauthorized access to a victim&#8217;s <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-56216-sql-injection-vulnerability-in-phpgurukul-hospital-management-system-4-0\/\"  data-wpil-monitor-id=\"85947\">system<\/a>. The potential for <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-54742-data-deserialization-vulnerability-in-wpevently-leading-to-possible-system-compromise\/\"  data-wpil-monitor-id=\"86358\">data loss and system<\/a> control underscores the need for immediate action and system patching.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-21455<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-2025-49401-critical-deserialization-of-untrusted-data-vulnerability-in-expresstech-systems-quiz-and-survey-master\/\"  data-wpil-monitor-id=\"87149\">System compromise and data<\/a> leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-58928639\" 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>Linux Kernel | 4.0 &#8211; 5.10<br \/>\nWindows 10 | All versions prior to the latest patch<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit works by submitting blob data to the kernel space through IOCTL. This can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-21125-serious-memory-corruption-vulnerability-leading-to-local-privilege-escalation\/\"  data-wpil-monitor-id=\"86025\">lead to memory corruption<\/a>, which an attacker can leverage to execute arbitrary code or cause a denial of service (system crash). The exploit essentially overruns the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47099-heap-based-buffer-overflow-vulnerability-in-incopy-leading-to-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"86802\">buffer in a way that overwrites the memory and leads<\/a> to potential unauthorized access or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3119626361\" 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 the vulnerability might be exploited. This pseudocode represents an attempt to overload the buffer and cause <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-22435-critical-memory-corruption-vulnerability-leading-to-privilege-escalation\/\"  data-wpil-monitor-id=\"86263\">memory corruption<\/a>.<\/p>\n<pre><code class=\"\" data-line=\"\">#include &lt;stdio.h&gt;\n#include &lt;sys\/ioctl.h&gt;\nint main(void)\n{\nchar buffer[1000];\nint fd = open(&quot;\/dev\/vulnerable_device&quot;, 0);\nmemset(buffer, &#039;A&#039;, 1000);\nioctl(fd, 0x8004, buffer);\nreturn 0;\n}<\/code><\/pre>\n<p>In this example, the program opens a device file, fills a buffer with 1000 bytes of &#8216;A&#8217; characters, and then submits this blob data to the kernel space using IOCTL. This causes <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46411-buffer-overflow-vulnerability-in-the-biosig-project-libbiosig\/\"  data-wpil-monitor-id=\"85863\">buffer overflow<\/a> and subsequently memory corruption, leading to potential system compromise.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>Users are strongly advised to apply the vendor patch in <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52327-sql-injection-vulnerability-in-restaurant-order-system-1-0\/\"  data-wpil-monitor-id=\"89949\">order to fully mitigate this vulnerability<\/a>. If the patch is not yet available or cannot be applied immediately, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation. These measures will help prevent the execution of malicious payloads and protect the system from <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7040-unauthorized-modification-of-data-in-cloud-saml-sso-plugin-for-wordpress\/\"  data-wpil-monitor-id=\"87724\">unauthorized access or data<\/a> leakage.<br \/>\nRemember, the best defense against vulnerabilities like CVE-2025-21455 is to maintain a strong <a href=\"https:\/\/www.ameeba.com\/blog\/ameeba-announces-cybersecurity-internship-program\/\"  data-wpil-monitor-id=\"87706\">cybersecurity<\/a> posture, promptly apply patches and updates, and employ robust safety measures.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview CVE-2025-21455 is a critical vulnerability that affects numerous systems and can potentially lead to severe impacts such as system compromise and data leakage. It involves memory corruption while submitting blob data to the kernel space through IOCTL. This vulnerability is particularly concerning because of its ability to expose sensitive data and provide an attacker [&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":[86,87],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-78663","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-linux","vendor-microsoft","product-linux-kernel","attack_vector-buffer-overflow","attack_vector-dos"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/78663","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=78663"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/78663\/revisions"}],"predecessor-version":[{"id":82821,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/78663\/revisions\/82821"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=78663"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=78663"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=78663"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=78663"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=78663"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=78663"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=78663"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=78663"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=78663"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}