{"id":41296,"date":"2025-05-20T19:49:43","date_gmt":"2025-05-20T19:49:43","guid":{"rendered":""},"modified":"2025-05-30T11:18:02","modified_gmt":"2025-05-30T17:18:02","slug":"cve-2025-45861-critical-buffer-overflow-vulnerability-in-totolink-a3002r-router","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-45861-critical-buffer-overflow-vulnerability-in-totolink-a3002r-router\/","title":{"rendered":"<strong>CVE-2025-45861: Critical Buffer Overflow Vulnerability in TOTOLINK A3002R Router<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In the continuous pursuit of a secure digital environment, acknowledging and addressing vulnerabilities is key. The latest vulnerability to be taken into account is CVE-2025-45861. This severe flaw resides in the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-7032-security-flaw-allowing-privilege-escalation-through-untrusted-data-deserialization\/\"  data-wpil-monitor-id=\"47523\">TOTOLINK A3002R<\/a> v4.0.0-B20230531.1404 router and can potentially compromise the entire system or lead to data leakage. This vulnerability is particularly alarming due to its high severity score, which pinpoints the <a href=\"https:\/\/www.ameeba.com\/blog\/emerging-cybersecurity-risks-in-apac-critical-insights-for-businesses\/\"  data-wpil-monitor-id=\"46560\">critical risk<\/a> associated with it. It is essential for concerned users and <a href=\"https:\/\/www.ameeba.com\/blog\/enisa-unveils-european-vulnerability-database-an-in-depth-look-into-the-cybersecurity-landscape\/\"  data-wpil-monitor-id=\"46299\">cybersecurity professionals to understand this vulnerability<\/a>, its effects, and the steps necessary to mitigate it.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-45861<br \/>\nSeverity: Critical (9.8\/10.0)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-34332-critical-vulnerability-in-ami-s-spx-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"47570\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2219381241\" 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-2025-45863-buffer-overflow-vulnerability-in-totolink-a3002r-routers\/\"  data-wpil-monitor-id=\"48886\">TOTOLINK A3002R<\/a> | v4.0.0-B20230531.1404<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit works through a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-49128-buffer-overflow-vulnerability-in-solid-edge-se2023\/\"  data-wpil-monitor-id=\"46350\">buffer overflow<\/a> in the formDnsv6 interface of the TOTOLINK A3002R router. Specifically, the routername parameter is susceptible to this overflow. An attacker can send crafted packets that exceed the expected input, causing the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4448-critical-buffer-overflow-vulnerability-in-d-link-dir-619l\/\"  data-wpil-monitor-id=\"47051\">buffer to overflow<\/a>. This overflow could then allow the attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47732-a-critical-remote-code-execution-vulnerability-in-microsoft-dataverse\/\"  data-wpil-monitor-id=\"46298\">execute arbitrary code<\/a> or disrupt the normal operation of the router, potentially leading to system compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3840750547\" 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 is a conceptual example demonstrating how a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-24189-memory-corruption-vulnerability-due-to-maliciously-crafted-web-content-in-various-operating-systems\/\"  data-wpil-monitor-id=\"51763\">malicious payload might be sent to the vulnerable<\/a> endpoint:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/formDnsv6 HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ &quot;routername&quot;: &quot;regularname&quot; + &quot;A&quot;*5000 }<\/code><\/pre>\n<p>In this example, the &#8220;routername&#8221; parameter is filled with a valid routername, followed by a string of &#8216;A&#8217; characters that&#8217;s long enough to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4446-critical-buffer-overflow-vulnerability-in-h3c-gr-5400ax\/\"  data-wpil-monitor-id=\"47057\">overflow the buffer<\/a>.<\/p>\n<p><strong>Recommended Mitigation<\/strong><\/p>\n<p>The best way to mitigate this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49002-critical-vulnerability-in-dataease-bypassing-patch-for-cve-2025-32966\/\"  data-wpil-monitor-id=\"76387\">vulnerability is to apply the vendor&#8217;s patch<\/a> as soon as it becomes available. In the meantime, or if a patch is not available, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used 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=\"76386\">block attempts to exploit this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In the continuous pursuit of a secure digital environment, acknowledging and addressing vulnerabilities is key. The latest vulnerability to be taken into account is CVE-2025-45861. This severe flaw resides in the TOTOLINK A3002R v4.0.0-B20230531.1404 router and can potentially compromise the entire system or lead to data leakage. This vulnerability is particularly alarming due to [&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-41296","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\/41296","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=41296"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/41296\/revisions"}],"predecessor-version":[{"id":68841,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/41296\/revisions\/68841"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=41296"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=41296"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=41296"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=41296"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=41296"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=41296"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=41296"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=41296"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=41296"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}