{"id":64178,"date":"2025-08-19T23:00:03","date_gmt":"2025-08-19T23:00:03","guid":{"rendered":""},"modified":"2025-10-03T07:08:54","modified_gmt":"2025-10-03T13:08:54","slug":"cve-2025-51451-bypass-login-vulnerability-in-totolink-ex1200t-firmware","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-51451-bypass-login-vulnerability-in-totolink-ex1200t-firmware\/","title":{"rendered":"<strong>CVE-2025-51451: Bypass Login Vulnerability in TOTOLINK EX1200T Firmware<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity landscape experiences constant changes, with new vulnerabilities emerging almost daily. One such vulnerability is CVE-2025-51451, a critical security flaw that affects TOTOLINK EX1200T firmware version 4.1.2cu.5215. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48903-permission-bypass-vulnerability-in-media-library-module\/\"  data-wpil-monitor-id=\"72878\">vulnerability allows attackers to bypass<\/a> login authentication by sending a specific request through formLoginAuth.htm, potentially compromising the system or causing data leakage. As TOTOLINK EX1200T is a widely used firmware, this vulnerability can have far-reaching repercussions, potentially affecting a large number of internet users.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-51451<br \/>\nSeverity: Critical, CVSS Score 9.8<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27050-memory-corruption-vulnerability-leading-to-potential-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"74957\">System compromise and potential data<\/a> leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2644617345\" 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 EX1200T Firmware | 4.1.2cu.5215<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of a flaw in the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8342-authentication-bypass-vulnerability-in-woocommerce-otp-login-with-phone-number-otp-verification-plugin\/\"  data-wpil-monitor-id=\"76681\">login authentication<\/a> process in TOTOLINK EX1200T firmware. Specifically, an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-9408-server-side-request-forgery-attack-in-eclipse-glassfish\/\"  data-wpil-monitor-id=\"77386\">attacker can send a specifically crafted request<\/a> to the formLoginAuth.htm page. This request causes the system to bypass the regular login process, granting the attacker <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53499-critical-unauthorized-access-vulnerability-in-wikimedia-foundation-mediawiki-abusefilter-extension\/\"  data-wpil-monitor-id=\"72867\">unauthorized access<\/a> to the system. With this access, the attacker can then <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-21432-memory-corruption-vulnerability-resulting-in-potential-system-compromise-or-data-leakage\/\"  data-wpil-monitor-id=\"76504\">compromise the system or cause data<\/a> leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-456314175\" 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 is a conceptual example of how the vulnerability might be exploited. Please note that this is a simplified example and the actual exploit would require more complex coding.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/formLoginAuth.htm HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nusername=attacker&amp;password=none&amp;operation=login<\/code><\/pre>\n<p>In this example, the attacker sends a POST request to the formLoginAuth.htm page. The username and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9114-critical-arbitrary-user-password-change-vulnerability-in-doccure-wordpress-theme\/\"  data-wpil-monitor-id=\"88298\">password fields are filled in with arbitrary<\/a> values. The operation parameter is set to &#8220;login&#8221;, triggering the login process. However, due to the vulnerability in the firmware, this login process is bypassed, and the attacker gains <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-44655-unauthorized-access-and-privilege-escalation-in-totolink-routers\/\"  data-wpil-monitor-id=\"73257\">unauthorized access<\/a> to the system.<\/p>\n<p><strong>Mitigation and Prevention<\/strong><\/p>\n<p>Users of the affected TOTOLINK EX1200T firmware are advised to apply the vendor patch as soon as it becomes available. Until then, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary mitigation measure 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=\"76503\">block attempts to exploit this vulnerability<\/a>. Regular updates and monitoring of the system are also recommended to prevent future attacks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity landscape experiences constant changes, with new vulnerabilities emerging almost daily. One such vulnerability is CVE-2025-51451, a critical security flaw that affects TOTOLINK EX1200T firmware version 4.1.2cu.5215. This vulnerability allows attackers to bypass login authentication by sending a specific request through formLoginAuth.htm, potentially compromising the system or causing data leakage. As TOTOLINK EX1200T [&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-64178","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\/64178","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=64178"}],"version-history":[{"count":8,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64178\/revisions"}],"predecessor-version":[{"id":81107,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64178\/revisions\/81107"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=64178"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=64178"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=64178"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=64178"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=64178"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=64178"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=64178"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=64178"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=64178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}