{"id":59600,"date":"2025-07-24T02:56:03","date_gmt":"2025-07-24T02:56:03","guid":{"rendered":""},"modified":"2025-08-31T18:37:49","modified_gmt":"2025-09-01T00:37:49","slug":"cve-2025-7758-critical-buffer-overflow-vulnerability-in-totolink-t6","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-7758-critical-buffer-overflow-vulnerability-in-totolink-t6\/","title":{"rendered":"<strong>CVE-2025-7758: Critical Buffer Overflow Vulnerability in TOTOLINK T6<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>A critical vulnerability has been identified in the TOTOLINK T6 firmware up to version 4.1.5cu.748_B20211015. This vulnerability pertains to a buffer overflow in the HTTP POST Request Handler&#8217;s setDiagnosisCfg function of the file \/cgi-bin\/cstecgi.cgi. The severity of this issue is accentuated by the public disclosure of the exploit, increasing the likelihood of its misuse by threat actors. This vulnerability is <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52808-a-critical-php-remote-file-inclusion-vulnerability-in-realtyelite\/\"  data-wpil-monitor-id=\"65905\">critical<\/a> as it opens up the possibility for remote attacks, potentially enabling system compromise or data leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-7758<br \/>\nSeverity: Critical, CVSS score 8.8<br \/>\nAttack Vector: Remote<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7419-critical-vulnerability-discovered-in-tenda-o3v2-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"70094\">Potential for system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3917211033\" 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 T6 | up to 4.1.5cu.748_B20211015<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability is exploited by manipulating the &#8216;ip&#8217; argument in a HTTP POST request to the &#8216;\/cgi-bin\/cstecgi.cgi&#8217; file. This manipulation results in a <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=\"66763\">buffer overflow<\/a> condition. <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53076-critical-overread-buffers-vulnerability-in-samsung-s-rlottie\/\"  data-wpil-monitor-id=\"66220\">Buffer overflow is a type of software vulnerability<\/a> that exists when an area of a program\u2019s memory that is used to store data can be overwritten with other data. This can cause the program to crash or, in the case of this exploit, allow an attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-26074-remote-code-execution-vulnerability-in-orkes-conductor-v3-21-11\/\"  data-wpil-monitor-id=\"66221\">execute arbitrary code<\/a> or system commands.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2105066532\" 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 representation of a HTTP POST <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-36845-server-side-request-forgery-ssrf-vulnerability-in-eveo-urve-web-manager\/\"  data-wpil-monitor-id=\"70739\">request that might be used to exploit this vulnerability<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/cgi-bin\/cstecgi.cgi HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nsetDiagnosisCfg=1&amp;ip=192.168.0.1[overflowing characters]<\/code><\/pre>\n<p>In this example, &#8216;overflowing characters&#8217; would be a crafted sequence of characters that cause the buffer overflow, potentially <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52688-critical-vulnerability-allowing-root-command-injection-on-access-point\/\"  data-wpil-monitor-id=\"70093\">allowing the attacker to execute arbitrary code or system commands<\/a>.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>Users of affected TOTOLINK T6 versions are advised to apply the vendor patch as soon as it becomes available. In the interim, measures such as deploying Web Application Firewalls (WAFs) or Intrusion Detection Systems (IDS) can be used as temporary mitigation against <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46334-critical-vulnerability-in-git-gui-enables-potential-system-compromise\/\"  data-wpil-monitor-id=\"70738\">potential attacks exploiting this vulnerability<\/a>. Regular monitoring of network traffic for unusual or suspicious activities can also aid in early <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20217-denial-of-service-vulnerability-in-snort-3-detection-engine-of-cisco-secure-firewall-threat-defense-software\/\"  data-wpil-monitor-id=\"77002\">detection of any attempt to exploit this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview A critical vulnerability has been identified in the TOTOLINK T6 firmware up to version 4.1.5cu.748_B20211015. This vulnerability pertains to a buffer overflow in the HTTP POST Request Handler&#8217;s setDiagnosisCfg function of the file \/cgi-bin\/cstecgi.cgi. The severity of this issue is accentuated by the public disclosure of the exploit, increasing the likelihood of its misuse [&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-59600","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\/59600","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=59600"}],"version-history":[{"count":6,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/59600\/revisions"}],"predecessor-version":[{"id":69401,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/59600\/revisions\/69401"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=59600"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=59600"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=59600"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=59600"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=59600"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=59600"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=59600"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=59600"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=59600"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}