{"id":57876,"date":"2025-07-06T22:44:20","date_gmt":"2025-07-06T22:44:20","guid":{"rendered":""},"modified":"2025-10-02T23:37:10","modified_gmt":"2025-10-03T05:37:10","slug":"cve-2025-6939-critical-buffer-overflow-vulnerability-in-totolink-a3002ru","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-6939-critical-buffer-overflow-vulnerability-in-totolink-a3002ru\/","title":{"rendered":"<strong>CVE-2025-6939: Critical Buffer Overflow Vulnerability in TOTOLINK A3002RU<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The CVE-2025-6939 is a critical vulnerability discovered in TOTOLINK A3002RU&#8217;s 3.0.0-B20230809.1615 version. This vulnerability resides in an unknown functionality within the \/boafrm\/formWlSiteSurvey file of the HTTP POST Request Handler. By manipulating the &#8216;submit-url&#8217; argument, an attacker can cause a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6568-critical-buffer-overflow-vulnerability-in-totolink-ex1200t\/\"  data-wpil-monitor-id=\"64441\">buffer overflow<\/a>, leading to potential system compromise or data leakage. Given the severity of this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20281-critical-vulnerability-in-cisco-ise-and-ise-pic-apis-allows-remote-code-execution\/\"  data-wpil-monitor-id=\"64592\">vulnerability and its potential to be exploited remotely<\/a>, immediate attention and mitigation are demanded.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-6939<br \/>\nSeverity: Critical (8.8 CVSS Severity Score)<br \/>\nAttack Vector: Remote<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3090-unauthenticated-remote-attack-leading-to-potential-data-leakage-and-system-compromise\/\"  data-wpil-monitor-id=\"64593\">System compromise and potential data leakage<\/a><\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3882156998\" 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>TOTOLINK A3002RU | 3.0.0-B20230809.1615<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability lies in the HTTP POST Request Handler of the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6627-critical-buffer-overflow-vulnerability-in-totolink-a702r-4-0-0-b20230721-1521\/\"  data-wpil-monitor-id=\"64657\">TOTOLINK<\/a> A3002RU device, specifically within the \/boafrm\/formWlSiteSurvey file. An attacker can exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48921-cross-site-request-forgery-vulnerability-in-drupal-open-social\/\"  data-wpil-monitor-id=\"65005\">vulnerability by sending a malicious HTTP POST request<\/a> with a manipulated &#8216;submit-url&#8217; argument. This manipulation causes a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6616-critical-buffer-overflow-vulnerability-in-d-link-dir-619l-2-06b01\/\"  data-wpil-monitor-id=\"64648\">buffer overflow<\/a> in the system, which can result in arbitrary code execution. Consequently, an attacker can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6435-firefox-vulnerability-leading-to-potential-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"64810\">potentially compromise the system and possibly leak sensitive data<\/a>.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1301592887\" 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>Here&#8217;s a conceptual example of how the vulnerability might be exploited:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/boafrm\/formWlSiteSurvey HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nsubmit-url=http:\/\/malicious.example.com&amp;...other parameters...<\/code><\/pre>\n<p>In this example, the attacker replaces the &#8216;submit-url&#8217; value with a malicious URL. This leads to a buffer overflow in the system, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6032-unverified-tls-certificate-in-podman-machine-init-command-leads-to-potential-man-in-the-middle-attack\/\"  data-wpil-monitor-id=\"64624\">potentially allowing the execution of arbitrary code and leading<\/a> to system compromise or data leakage.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>Users of the affected TOTOLINK A3002RU version are advised to apply the vendor patch immediately. If the vendor patch is not yet available, a temporary mitigation strategy could be to implement a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to block malicious <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8243-critical-buffer-overflow-vulnerability-in-totolink-x15-http-post-request-handler\/\"  data-wpil-monitor-id=\"66765\">HTTP POST requests<\/a>. However, this is a temporary solution and the vendor patch should be applied as soon as it becomes <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2021-26383-critical-vulnerability-in-amd-tee-puts-system-integrity-and-data-availability-in-jeopardy\/\"  data-wpil-monitor-id=\"88036\">available to fully mitigate the vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The CVE-2025-6939 is a critical vulnerability discovered in TOTOLINK A3002RU&#8217;s 3.0.0-B20230809.1615 version. This vulnerability resides in an unknown functionality within the \/boafrm\/formWlSiteSurvey file of the HTTP POST Request Handler. By manipulating the &#8216;submit-url&#8217; argument, an attacker can cause a buffer overflow, leading to potential system compromise or data leakage. Given the severity of 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":[86,80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-57876","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-rce"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/57876","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=57876"}],"version-history":[{"count":9,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/57876\/revisions"}],"predecessor-version":[{"id":80852,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/57876\/revisions\/80852"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=57876"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=57876"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=57876"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=57876"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=57876"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=57876"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=57876"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=57876"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=57876"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}