{"id":37893,"date":"2025-05-12T22:35:56","date_gmt":"2025-05-12T22:35:56","guid":{"rendered":""},"modified":"2025-10-22T00:14:22","modified_gmt":"2025-10-22T06:14:22","slug":"cve-2025-4356-critical-buffer-overflow-vulnerability-in-tenda-dap-1520","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-4356-critical-buffer-overflow-vulnerability-in-tenda-dap-1520\/","title":{"rendered":"<strong>CVE-2025-4356: Critical Buffer Overflow Vulnerability in Tenda DAP-1520<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>Cybersecurity vulnerabilities are a constant threat in today&#8217;s interconnected world, and the recent discovery of the CVE-2025-4356 vulnerability highlights this fact. This critical security vulnerability, which has been discovered in Tenda DAP-1520 1.10B04_BETA02, affects the Authentication Handler&#8217;s function, potentially leading to severe consequences like system compromise or data leakage. This <a class=\"wpil_keyword_link\" href=\"https:\/\/ameeba.com\"   title=\"vulnerability\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"42659\">vulnerability<\/a> is particularly concerning as it can be exploited remotely and has already been disclosed to the public, increasing the risk of misuse by malicious actors.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-4356<br \/>\nSeverity: Critical (8.8 CVSS Severity Score)<br \/>\nAttack Vector: Remote<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: Potential system compromise or <a class=\"wpil_keyword_link\" href=\"https:\/\/chat.ameeba.com\"   title=\"data\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"42658\">data<\/a> leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3666202687\" 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>Tenda DAP-1520 | 1.10B04_BETA02<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit targets the `mod_graph_auth_uri_handler` function of the `\/storage` file in the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46625-root-shell-access-exploit-in-tenda-rx2-pro-router\/\"  data-wpil-monitor-id=\"42901\">Tenda<\/a> DAP-1520&#8217;s software. This function is responsible for handling authentication requests, but a flaw in its design allows for a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-38583-stack-based-buffer-overflow-vulnerability-in-gtkwave-3-3-115\/\"  data-wpil-monitor-id=\"43040\">stack-based buffer overflow<\/a>. In layman&#8217;s terms, this means that an attacker can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4096-remote-heap-buffer-overflow-vulnerability-in-google-chrome-html-processing\/\"  data-wpil-monitor-id=\"43117\">overflow the buffer<\/a> with excess data, causing the system to write into adjacent memory spaces. This can lead to arbitrary code execution, which allows the attacker to gain <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3952-unauthorized-modification-of-data-in-projectopia-wordpress-plugin\/\"  data-wpil-monitor-id=\"42587\">unauthorized access to the system or leak sensitive data<\/a>.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1724063645\" 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>Below is a conceptual example of how the vulnerability might be exploited. This is a illustrative HTTP request that includes a malicious <a class=\"wpil_keyword_link\" href=\"https:\/\/www.ameeba.com\"   title=\"payload\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"42660\">payload<\/a> designed to overflow the buffer.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/storage\/mod_graph_auth_uri_handler HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ &quot;auth_request&quot;: &quot;A&quot;.repeat(2048) }<\/code><\/pre>\n<p>In this example, the `&#8221;A&#8221;.repeat(2048)` is a string that is long enough to overflow the buffer in the `mod_graph_auth_uri_handler` function, leading to the potential for <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-37419-critical-arbitrary-code-execution-vulnerability-in-gtkwave-3-3-115\/\"  data-wpil-monitor-id=\"42675\">arbitrary code execution<\/a>.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>While the best way to address this vulnerability is to apply the patch provided by the vendor, in the interim, using <a class=\"wpil_keyword_link\" href=\"https:\/\/www.ameeba.com\/pseudopod\"   title=\"Web\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"90968\">Web<\/a> Application Firewalls (WAF) or Intrusion Detection Systems (IDS) can provide temporary mitigation. These <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4050-heap-corruption-in-google-chrome-devtools-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"43118\">systems can potentially<\/a> block or detect the abnormal behavior associated with the exploitation of this vulnerability. However, it should be emphasized that these are temporary measures, and updating the affected <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7028-exploiting-the-software-smi-handler-vulnerability\/\"  data-wpil-monitor-id=\"88181\">software is the only surefire way to prevent exploitation<\/a> of this vulnerability.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview Cybersecurity vulnerabilities are a constant threat in today&#8217;s interconnected world, and the recent discovery of the CVE-2025-4356 vulnerability highlights this fact. This critical security vulnerability, which has been discovered in Tenda DAP-1520 1.10B04_BETA02, affects the Authentication Handler&#8217;s function, potentially leading to severe consequences like system compromise or data leakage. This vulnerability is particularly concerning [&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":[86,80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-37893","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-rce"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37893","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=37893"}],"version-history":[{"count":9,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37893\/revisions"}],"predecessor-version":[{"id":83925,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/37893\/revisions\/83925"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=37893"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=37893"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=37893"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=37893"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=37893"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=37893"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=37893"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=37893"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=37893"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}