{"id":52964,"date":"2025-06-17T11:21:44","date_gmt":"2025-06-17T11:21:44","guid":{"rendered":""},"modified":"2025-06-19T11:17:53","modified_gmt":"2025-06-19T17:17:53","slug":"cve-2025-5911-critical-vulnerability-in-totolink-ex1200t-leading-to-buffer-overflow","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-5911-critical-vulnerability-in-totolink-ex1200t-leading-to-buffer-overflow\/","title":{"rendered":"<strong>CVE-2025-5911: Critical Vulnerability in TOTOLINK EX1200T Leading to Buffer Overflow<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity landscape is filled with an array of threats and vulnerabilities, with one of the recent ones being the CVE-2025-5911. This vulnerability affects TOTOLINK EX1200T up to version 4.1.2cu.5232_B20210713. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49073-critical-deserialization-vulnerability-in-axiomthemes-sweet-dessert\/\"  data-wpil-monitor-id=\"59268\">vulnerability is classified as critical<\/a>, posing a significant threat to the security of any system running the affected software. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47586-php-remote-file-inclusion-vulnerability-in-stylemixthemes-motors-events\/\"  data-wpil-monitor-id=\"59951\">vulnerability involves an unknown function in the file<\/a> \/boafrm\/formDMZ of the HTTP POST Request Handler component. If exploited, it can lead to a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5607-critical-buffer-overflow-vulnerability-in-tenda-ac18\/\"  data-wpil-monitor-id=\"59364\">buffer overflow<\/a>, which could potentially compromise the system and lead to data leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-5911<br \/>\nSeverity: Critical, with a CVSS score of 8.8<br \/>\nAttack Vector: Remote<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31222-potential-privilege-elevation-and-system-compromise-vulnerability\/\"  data-wpil-monitor-id=\"59676\">Potential system compromise<\/a> and data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2833931635\" 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-2025-5793-critical-buffer-overflow-vulnerability-in-totolink-ex1200t-4-1-2cu-5232-b20210713\/\"  data-wpil-monitor-id=\"59974\">TOTOLINK EX1200T<\/a> | Up to 4.1.2cu.5232_B20210713<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit works by manipulating the HTTP POST Request Handler in the file \/boafrm\/formDMZ, causing a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5572-stack-based-buffer-overflow-vulnerability-in-d-link-dcs-932l-2-18-01\/\"  data-wpil-monitor-id=\"59368\">buffer overflow<\/a>. A <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5672-critical-buffer-overflow-vulnerability-in-totolink-n302r-plus\/\"  data-wpil-monitor-id=\"59535\">buffer overflow<\/a> occurs when more data is written to a buffer than it can handle, causing it to overwrite adjacent memory. This can disrupt the normal flow of the application, allowing an attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-1329-local-user-arbitrary-code-execution-vulnerability-in-ibm-cics-tx\/\"  data-wpil-monitor-id=\"59380\">execute arbitrary code<\/a> or crash the system.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1943046791\" 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 example of how the vulnerability may be exploited. This is a sample <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5671-critical-buffer-overflow-vulnerability-in-totolink-n302r-plus-http-post-request-handler\/\"  data-wpil-monitor-id=\"59485\">HTTP POST request that sends more data than the buffer<\/a> can handle, causing an overflow.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/boafrm\/formDMZ HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ &quot;buffer_overflow_data&quot;: &quot;AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...&quot; }<\/code><\/pre>\n<p>The string &#8220;A&#8221; is repeated many times to fill the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5630-critical-buffer-overflow-vulnerability-in-d-link-dir-816-1-10cnb05\/\"  data-wpil-monitor-id=\"59640\">buffer and cause an overflow<\/a>. In a real-world attack, this could be replaced with malicious code that takes control of the system or extracts <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5893-unauthenticated-access-and-exposure-of-sensitive-information-in-smart-parking-management-system\/\"  data-wpil-monitor-id=\"59756\">sensitive information<\/a>.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>To mitigate this vulnerability, users are advised to apply the vendor patch as soon as it becomes available. In the meantime, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation measure. These tools can help detect and block malicious traffic, reducing the risk of a successful exploit.<br \/>\nBy staying vigilant and applying patches promptly, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-1330-local-user-arbitrary-code-execution-vulnerability-in-ibm-cics-tx\/\"  data-wpil-monitor-id=\"59416\">users can significantly reduce the impact of vulnerabilities<\/a> like CVE-2025-5911.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity landscape is filled with an array of threats and vulnerabilities, with one of the recent ones being the CVE-2025-5911. This vulnerability affects TOTOLINK EX1200T up to version 4.1.2cu.5232_B20210713. The vulnerability is classified as critical, posing a significant threat to the security of any system running the affected software. The vulnerability involves an [&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],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-52964","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/52964","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=52964"}],"version-history":[{"count":12,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/52964\/revisions"}],"predecessor-version":[{"id":53661,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/52964\/revisions\/53661"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=52964"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=52964"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=52964"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=52964"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=52964"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=52964"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=52964"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=52964"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=52964"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}