{"id":59708,"date":"2025-07-28T15:44:09","date_gmt":"2025-07-28T15:44:09","guid":{"rendered":""},"modified":"2025-09-07T11:38:54","modified_gmt":"2025-09-07T17:38:54","slug":"cve-2025-21485-fastrpc-memory-corruption-vulnerability","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-21485-fastrpc-memory-corruption-vulnerability\/","title":{"rendered":"<strong>CVE-2025-21485: FastRPC Memory Corruption Vulnerability<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity landscape is evolving rapidly, with new threats emerging at a staggering rate. One such threat is the CVE-2025-21485, a severe vulnerability in the processing of INIT and multimode invoke IOCTL calls on FastRPC. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30419-memory-corruption-vulnerability-in-ni-circuit-design-suite\/\"  data-wpil-monitor-id=\"68133\">vulnerability stems from a memory corruption<\/a> issue, which can be exploited to compromise the system or lead to data leakage. Being ubiquitous in many systems, FastRPC&#8217;s susceptibility to such a flaw raises significant concerns for users across the globe.<br \/>\nThe <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-40600-severe-externally-controlled-format-string-vulnerability-in-sonicos-ssl-vpn-interface\/\"  data-wpil-monitor-id=\"69778\">severity of this vulnerability<\/a>, combined with its widespread potential impact, underscores the necessity for immediate action. With a CVSS score of 7.8, it poses a substantial risk and needs to be addressed promptly to prevent <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-7457-macos-authorization-model-exploit-leading-to-potential-mitm-attacks\/\"  data-wpil-monitor-id=\"80101\">potential exploitation<\/a> by malicious actors.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-21485<br \/>\nSeverity: High (CVSS: 7.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8040-memory-safety-bugs-causing-potential-system-compromise-in-firefox-and-thunderbird\/\"  data-wpil-monitor-id=\"71232\">System Compromise<\/a>, Data Leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-803885617\" 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>FastRPC | 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=\"78037\">versions prior<\/a> to 3.0.0<\/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=\"71722\">vulnerability lies in the improper handling<\/a> of certain IOCTL calls by FastRPC. An <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-42959-unauthenticated-replay-attack-exploiting-hmac-reuse\/\"  data-wpil-monitor-id=\"71723\">attacker can exploit<\/a> this by sending specially crafted INIT and multimode invoke IOCTL calls to the FastRPC interface. These calls cause <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30417-memory-corruption-vulnerability-in-ni-circuit-design-suite\/\"  data-wpil-monitor-id=\"68205\">memory corruption<\/a>, enabling the attacker to execute arbitrary code or access sensitive information.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-266140338\" 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 conceptual pseudocode demonstrates how an attacker might exploit the vulnerability:<\/p>\n<pre><code class=\"\" data-line=\"\">#include &lt;sys\/ioctl.h&gt;\n#include &lt;fcntl.h&gt;\nint main() {\nint fd = open(&quot;\/dev\/fastrpc&quot;, O_RDWR);\nchar payload[4096] = { \/* crafted payload causing memory corruption *\/ };\n\/\/ INIT IOCTL call\nioctl(fd, FASTRPC_IOCTL_INIT, payload);\n\/\/ Multimode invoke IOCTL call\nioctl(fd, FASTRPC_IOCTL_INVOKE, payload);\nclose(fd);\nreturn 0;\n}<\/code><\/pre>\n<p><strong>Prevention and Mitigation<\/strong><\/p>\n<p>The best way to prevent exploitation of this vulnerability is to apply the vendor&#8217;s patch. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can offer temporary mitigation. However, these are not foolproof solutions and can only reduce, not eliminate, the risk. Therefore, applying the patch at the earliest opportunity is strongly recommended.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity landscape is evolving rapidly, with new threats emerging at a staggering rate. One such threat is the CVE-2025-21485, a severe vulnerability in the processing of INIT and multimode invoke IOCTL calls on FastRPC. The vulnerability stems from a memory corruption issue, which can be exploited to compromise the system or lead to [&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":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-59708","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/59708","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=59708"}],"version-history":[{"count":7,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/59708\/revisions"}],"predecessor-version":[{"id":72515,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/59708\/revisions\/72515"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=59708"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=59708"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=59708"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=59708"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=59708"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=59708"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=59708"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=59708"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=59708"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}