{"id":43697,"date":"2025-05-24T08:26:30","date_gmt":"2025-05-24T08:26:30","guid":{"rendered":""},"modified":"2025-06-25T05:34:48","modified_gmt":"2025-06-25T11:34:48","slug":"cve-2025-4835-critical-buffer-overflow-vulnerability-in-totolink-routers","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-4835-critical-buffer-overflow-vulnerability-in-totolink-routers\/","title":{"rendered":"<strong>CVE-2025-4835: Critical Buffer Overflow Vulnerability in TOTOLINK Routers<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>A critical vulnerability, CVE-2025-4835, has been identified in TOTOLINK A702R, A3002R, and A3002RU routers. This vulnerability resides in an unknown functionality of the file \/boafrm\/formWlanRedirect of the HTTP POST Request Handler component. This vulnerability is particularly dangerous as attackers can exploit it remotely, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27891-samsung-mobile-and-wearable-processors-vulnerability-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"49289\">potentially leading to a full system<\/a> compromise or significant data leakage. Given the severity of the potential impact, it&#8217;s crucial for users and administrators of TOTOLINK <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4809-critical-vulnerability-in-tenda-ac7-router-leads-to-system-compromise\/\"  data-wpil-monitor-id=\"50604\">routers to understand and address this vulnerability<\/a> promptly.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-4835<br \/>\nSeverity: Critical (CVSS: 8.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31263-critical-memory-handling-vulnerability-could-lead-to-system-compromise-or-data-leakage-in-macos-sequoia-15-4\/\"  data-wpil-monitor-id=\"57030\">System Compromise<\/a>, Data Leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3935017965\" 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: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\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: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\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: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/div>\n<p>Product | Affected Versions<\/p>\n<p><a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4825-critical-buffer-overflow-vulnerability-in-totolink-a702r-a3002r-and-a3002ru-routers\/\"  data-wpil-monitor-id=\"51235\">TOTOLINK A702R<\/a> | 3.0.0-B20230809.1615<br \/>\n<a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4732-critical-buffer-overflow-vulnerability-in-totolink-a3002r-and-a3002ru\/\"  data-wpil-monitor-id=\"50755\">TOTOLINK A3002R<\/a> | 3.0.0-B20230809.1615<br \/>\nTOTOLINK A3002RU | 3.0.0-B20230809.1615<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43560-improper-input-validation-vulnerability-in-coldfusion-allowing-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"49357\">vulnerability stems from improper<\/a> handling of the &#8216;redirect-url&#8217; argument in the HTTP POST Request Handler of the file \/boafrm\/formWlanRedirect. By manipulating this argument, an attacker can trigger a buffer overflow condition, potentially <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43559-coldfusion-improper-input-validation-vulnerability-leading-to-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"49225\">leading to execution of arbitrary code<\/a> or causing the system to crash. Since the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-41645-unauthenticated-remote-attacker-hijacking-via-demo-account\/\"  data-wpil-monitor-id=\"49976\">attack can be initiated remotely<\/a>, an attacker does not need physical access to the device or valid user credentials to exploit this vulnerability.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2498024449\" 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>This conceptual code shows a HTTP POST <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47708-cross-site-request-forgery-vulnerability-in-drupal-enterprise-mfa-tfa\/\"  data-wpil-monitor-id=\"49776\">request that might be used to exploit the vulnerability<\/a>. An attacker sends a maliciously crafted &#8216;redirect-url&#8217; argument to the target router, leading to a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-29964-heap-based-buffer-overflow-vulnerability-in-windows-media\/\"  data-wpil-monitor-id=\"49499\">buffer overflow<\/a>.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/boafrm\/formWlanRedirect HTTP\/1.1\nHost: target-router-ip\nContent-Type: application\/x-www-form-urlencoded\nredirect-url=AAAAAAA...[long string]...<\/code><\/pre>\n<p>In this example, the &#8216;redirect-url&#8217; argument is filled with an excessively long string of &#8216;A&#8217;s, which can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-29962-heap-based-buffer-overflow-vulnerability-in-windows-media\/\"  data-wpil-monitor-id=\"49506\">overflow the buffer<\/a> and potentially execute malicious code.<\/p>\n<p><strong>Mitigation and Remediation<\/strong><\/p>\n<p>Users and administrators are advised to apply the vendor-provided patch as soon as possible. If immediate patching is not feasible, the use of a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as temporary mitigation measures. These can help <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45984-critical-command-injection-vulnerability-detected-in-blink-routers\/\"  data-wpil-monitor-id=\"61348\">detect and block attempts to exploit this vulnerability<\/a>. However, these are not long-term solutions and will not completely eliminate the risk. As such, the application of the vendor patch should be prioritized.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview A critical vulnerability, CVE-2025-4835, has been identified in TOTOLINK A702R, A3002R, and A3002RU routers. This vulnerability resides in an unknown functionality of the file \/boafrm\/formWlanRedirect of the HTTP POST Request Handler component. This vulnerability is particularly dangerous as attackers can exploit it remotely, potentially leading to a full system compromise or significant data leakage. [&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-43697","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\/43697","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=43697"}],"version-history":[{"count":12,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/43697\/revisions"}],"predecessor-version":[{"id":55025,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/43697\/revisions\/55025"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=43697"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=43697"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=43697"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=43697"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=43697"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=43697"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=43697"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=43697"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=43697"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}