{"id":64189,"date":"2025-08-20T10:04:43","date_gmt":"2025-08-20T10:04:43","guid":{"rendered":""},"modified":"2025-10-20T15:23:23","modified_gmt":"2025-10-20T21:23:23","slug":"cve-2025-50163-critical-heap-based-buffer-overflow-in-windows-routing-and-remote-access-service-rras","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-50163-critical-heap-based-buffer-overflow-in-windows-routing-and-remote-access-service-rras\/","title":{"rendered":"<strong>CVE-2025-50163: Critical Heap-Based Buffer Overflow in Windows Routing and Remote Access Service (RRAS)<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In this article, we delve into the technical aspects of a recently discovered and serious vulnerability: the CVE-2025-50163. This issue is a heap-based buffer overflow found in Microsoft&#8217;s Windows Routing and Remote Access Service (RRAS). The vulnerability is of high concern since it provides an attacker with a method to execute arbitrary code over a network, potentially leading to system compromise or <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53495-unauthorized-access-data-leakage-in-wikimedia-foundation-mediawiki-abusefilter-extension\/\"  data-wpil-monitor-id=\"72477\">data leakage<\/a>. This makes the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53762-privilege-elevation-vulnerability-in-microsoft-purview\/\"  data-wpil-monitor-id=\"72939\">vulnerability a significant threat to organizations that depend on Microsoft&#8217;s<\/a> RRAS for their network solutions.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-50163<br \/>\nSeverity: High (8.8 CVSS Severity Score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-40741-stack-based-overflow-vulnerability-in-solid-edge-se2025-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"75775\">System compromise and potential<\/a> data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3170635850\" 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><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53786-microsoft-exchange-server-security-vulnerability-in-hybrid-deployments\/\"  data-wpil-monitor-id=\"81287\">Microsoft Windows Server<\/a> | 2012, 2012 R2, 2016, 2019<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>This exploit relies on a heap-based <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8184-critical-stack-based-buffer-overflow-vulnerability-in-d-link-dir-513\/\"  data-wpil-monitor-id=\"71779\">buffer overflow vulnerability<\/a> in the Windows RRAS. <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7463-critical-buffer-overflow-vulnerability-in-tenda-fh1201-1-2-0-14\/\"  data-wpil-monitor-id=\"71833\">Buffer overflows<\/a> occur when more data is written into a block of memory, or buffer, than it can hold. In this case, an attacker manipulates the <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=\"78437\">buffer in the RRAS<\/a>, causing it to overflow and allowing the attacker to overwrite memory in the heap.<br \/>\nHeap memory is dynamically allocated at runtime and can be manipulated by an attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27052-memory-corruption-vulnerability-in-unix-clients-processing-data-packets\/\"  data-wpil-monitor-id=\"74128\">overflow<\/a> with malicious data. When executed, this data can cause the system to behave unpredictably, including <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47168-use-after-free-vulnerability-in-microsoft-office-word-allowing-unauthorized-code-execution\/\"  data-wpil-monitor-id=\"73201\">allowing arbitrary code<\/a> execution.<br \/>\nThe attacker can exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55293-high-risk-vulnerability-in-meshtastic-s-mesh-networking-solution\/\"  data-wpil-monitor-id=\"81355\">vulnerability over a network<\/a> and does not require any special privileges or user interaction to successfully exploit this vulnerability.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2893398793\" 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 conceptual representation of how the malicious payload might be delivered to a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-23311-stack-overflow-vulnerability-in-nvidia-triton-inference-server-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"78809\">vulnerable server<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/RRAS\/endpoint HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/octet-stream\n{ &quot;buffer_data&quot;: &quot;A&quot;*5000 }<\/code><\/pre>\n<p>In this mock example, the attacker is sending a POST request to the RRAS endpoint of the target server with a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49691-heap-based-buffer-overflow-in-windows-media-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"72015\">buffer overflow<\/a> payload. The payload consists of &#8216;A&#8217; character repeated 5000 times, representing an attempt to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49674-windows-rras-heap-based-buffer-overflow-vulnerability\/\"  data-wpil-monitor-id=\"72308\">overflow the buffer<\/a>.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>The best way to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43728-protection-mechanism-failure-vulnerability-in-dell-thinos\/\"  data-wpil-monitor-id=\"90288\">protect against this vulnerability<\/a> is to apply the vendor-provided patch as soon as practical. If application of the patch is delayed, use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) as a temporary mitigation measure. These can be configured to detect and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8059-critical-privilege-escalation-vulnerability-in-b-blocks-wordpress-plugin\/\"  data-wpil-monitor-id=\"76505\">block attempts to exploit this vulnerability<\/a>, providing a stop-gap until the patch can be applied. Keep in mind, these are temporary solutions and applying the patch is the more permanent and secure method of mitigation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In this article, we delve into the technical aspects of a recently discovered and serious vulnerability: the CVE-2025-50163. This issue is a heap-based buffer overflow found in Microsoft&#8217;s Windows Routing and Remote Access Service (RRAS). The vulnerability is of high concern since it provides an attacker with a method to execute arbitrary code over [&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":[86,80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64189","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft","attack_vector-buffer-overflow","attack_vector-rce"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64189","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=64189"}],"version-history":[{"count":15,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64189\/revisions"}],"predecessor-version":[{"id":83228,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64189\/revisions\/83228"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=64189"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=64189"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=64189"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=64189"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=64189"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=64189"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=64189"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=64189"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=64189"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}