{"id":43338,"date":"2025-05-23T21:22:16","date_gmt":"2025-05-23T21:22:16","guid":{"rendered":""},"modified":"2025-05-30T17:53:46","modified_gmt":"2025-05-30T23:53:46","slug":"cve-2025-4823-critical-buffer-overflow-vulnerability-in-totolink-routers","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-4823-critical-buffer-overflow-vulnerability-in-totolink-routers\/","title":{"rendered":"<strong>CVE-2025-4823: Critical Buffer Overflow Vulnerability in TOTOLINK Routers<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>CVE-2025-4823 is a critical vulnerability discovered in TOTOLINK A702R, A3002R, and A3002RU routers. This vulnerability has a high impact on the security of these devices, as it allows attackers to potentially compromise the system or leak sensitive data. The flaw lies within the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4827-critical-buffer-overflow-vulnerability-in-totolink-http-post-request-handler\/\"  data-wpil-monitor-id=\"50914\">HTTP POST Request<\/a> Handler, specifically the function submit-url of the file \/boafrm\/formReflashClientTbl. Given the widespread use of these routers, this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31637-high-risk-sql-injection-vulnerability-in-lambertgroup-shout\/\"  data-wpil-monitor-id=\"51853\">vulnerability poses a significant risk<\/a> to both individuals and organizations, necessitating immediate attention and remediation.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-4823<br \/>\nSeverity: Critical (8.8 CVSS Score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <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=\"49308\">System compromise and potential<\/a> data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2388662527\" 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-2025-4825-critical-buffer-overflow-vulnerability-in-totolink-a702r-a3002r-and-a3002ru-routers\/\"  data-wpil-monitor-id=\"51245\">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=\"50764\">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-2025-45863-buffer-overflow-vulnerability-in-totolink-a3002r-routers\/\"  data-wpil-monitor-id=\"48883\">vulnerability is a buffer overflow<\/a> issue. It arises due to insufficient bounds checking by the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4829-critical-buffer-overflow-vulnerability-in-totolink-http-post-request-handler\/\"  data-wpil-monitor-id=\"52198\">HTTP POST Request<\/a> Handler when processing input data within the submit-url function of the \/boafrm\/formReflashClientTbl file. An attacker could exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47708-cross-site-request-forgery-vulnerability-in-drupal-enterprise-mfa-tfa\/\"  data-wpil-monitor-id=\"49782\">vulnerability by sending a specially crafted HTTP POST request<\/a> with an oversized payload to the vulnerable endpoint. This could <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45861-critical-buffer-overflow-vulnerability-in-totolink-a3002r-router\/\"  data-wpil-monitor-id=\"48902\">overflow the buffer<\/a>, causing memory corruption, and potentially allowing the attacker to execute arbitrary code or cause a Denial of Service (DoS) condition.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1136157613\" 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 basic concept of how the vulnerability might be exploited:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/boafrm\/formReflashClientTbl HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nContent-Length: [Length]\nsubmit-url=[overly long string here]<\/code><\/pre>\n<p>In this conceptual example, the &#8220;submit-url&#8221; parameter contains a string that is longer than the buffer can handle, causing a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45865-critical-buffer-overflow-vulnerability-in-totolink-a3002r\/\"  data-wpil-monitor-id=\"48973\">buffer overflow<\/a>.<br \/>\nPlease note that this is a simplified representation of how an exploit might look, and a real-world exploit would likely be more complex and tailored to the specific characteristics of the target system.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview CVE-2025-4823 is a critical vulnerability discovered in TOTOLINK A702R, A3002R, and A3002RU routers. This vulnerability has a high impact on the security of these devices, as it allows attackers to potentially compromise the system or leak sensitive data. The flaw lies within the HTTP POST Request Handler, specifically the function submit-url of the file [&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":[86,87],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-43338","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-dos"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/43338","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=43338"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/43338\/revisions"}],"predecessor-version":[{"id":46702,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/43338\/revisions\/46702"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=43338"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=43338"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=43338"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=43338"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=43338"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=43338"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=43338"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=43338"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=43338"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}