{"id":56030,"date":"2025-06-29T22:34:39","date_gmt":"2025-06-29T22:34:39","guid":{"rendered":""},"modified":"2025-08-30T11:54:33","modified_gmt":"2025-08-30T17:54:33","slug":"cve-2025-5866-critical-vulnerability-in-rt-thread-5-1-0-potentially-leading-to-system-compromise-or-data-leakage","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-5866-critical-vulnerability-in-rt-thread-5-1-0-potentially-leading-to-system-compromise-or-data-leakage\/","title":{"rendered":"<strong>CVE-2025-5866: Critical Vulnerability in RT-Thread 5.1.0 Potentially Leading to System Compromise or Data Leakage<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>A critical vulnerability, identified as CVE-2025-5866, has been discovered in RT-Thread 5.1.0 that poses a significant risk to system integrity and data privacy. This vulnerability specifically affects the sys_sigprocmask function within the file rt-thread\/components\/lwp\/lwp_syscall.c. By exploiting this vulnerability, an attacker could manipulate the &#8216;how&#8217; argument, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43586-adobe-commerce-improper-access-control-vulnerability-leading-to-privilege-escalation\/\"  data-wpil-monitor-id=\"63136\">leading to an improper<\/a> validation of array index. This vulnerability is of particular concern due to the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31919-deserialization-of-untrusted-data-vulnerability-in-themeton-spare\/\"  data-wpil-monitor-id=\"62342\">potential for system<\/a> compromise and data leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-5866<br \/>\nSeverity: Critical (CVSS: 8.0)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49415-path-traversal-vulnerability-in-fw-gallery-with-potential-for-system-compromise\/\"  data-wpil-monitor-id=\"62389\">System compromise and potential<\/a> data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3236641620\" 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>RT-Thread | 5.1.0<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of the sys_sigprocmask function of the RT-Thread 5.1.0. By manipulating the &#8216;how&#8217; argument, an attacker can cause an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47982-improper-input-validation-vulnerability-in-windows-storage-vsp-driver-leading-to-privilege-escalation\/\"  data-wpil-monitor-id=\"75544\">improper validation<\/a> of the array index. This can lead to unexpected behavior, potentially allowing a malicious user to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49220-pre-authentication-remote-code-execution-in-trend-micro-apex-central\/\"  data-wpil-monitor-id=\"62563\">execute arbitrary code<\/a>, compromise the system, or leak sensitive data.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1741217080\" 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>While no specific exploit code has been made public, a conceptual example might involve passing an unexpected value to the &#8216;how&#8217; argument in the sys_sigprocmask function. This could <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32878-critical-vulnerability-in-coros-pace-3-devices-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"63177\">potentially be done via a crafted system<\/a> call or manipulated user input. The following pseudocode might represent an example of how this could occur:<\/p>\n<pre><code class=\"\" data-line=\"\">#include &quot;rtthread.h&quot;\nvoid exploit() {\n\/\/ Obtain a handle to the vulnerable function\nvoid (*vulnerable_function)(int, const rt_sigset_t *, rt_sigset_t *) = &amp;rt_sys_sigprocmask;\n\/\/ Create a signal set\nrt_sigset_t sigset;\n\/\/ Set all bits in the signal set\nsigset = -1;\n\/\/ Call the vulnerable function with an unexpected &#039;how&#039; argument\nvulnerable_function(9999, &amp;sigset, NULL);\n}<\/code><\/pre>\n<p>This is a simplified example and actual exploitation may involve more complex steps and knowledge of the internals of RT-Thread.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>Users are advised to apply the vendor patch as soon as it becomes available. In the meantime, the use of a web application firewall (WAF) or intrusion detection system (IDS) may provide temporary mitigation. However, these should not be considered long-term solutions, as they may not completely <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49155-uncontrolled-search-path-vulnerability-in-trend-micro-apex-one-data-loss-prevention-module\/\"  data-wpil-monitor-id=\"62483\">prevent exploitation of this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview A critical vulnerability, identified as CVE-2025-5866, has been discovered in RT-Thread 5.1.0 that poses a significant risk to system integrity and data privacy. This vulnerability specifically affects the sys_sigprocmask function within the file rt-thread\/components\/lwp\/lwp_syscall.c. By exploiting this vulnerability, an attacker could manipulate the &#8216;how&#8217; argument, leading to an improper validation of array index. 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":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-56030","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\/56030","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=56030"}],"version-history":[{"count":7,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/56030\/revisions"}],"predecessor-version":[{"id":68078,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/56030\/revisions\/68078"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=56030"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=56030"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=56030"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=56030"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=56030"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=56030"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=56030"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=56030"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=56030"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}