{"id":79369,"date":"2025-09-30T05:58:41","date_gmt":"2025-09-30T05:58:41","guid":{"rendered":""},"modified":"2025-10-02T05:37:03","modified_gmt":"2025-10-02T11:37:03","slug":"cve-2025-10838-critical-buffer-overflow-vulnerability-in-tenda-ac21-16-03-08-16","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-10838-critical-buffer-overflow-vulnerability-in-tenda-ac21-16-03-08-16\/","title":{"rendered":"<strong>CVE-2025-10838: Critical Buffer Overflow Vulnerability in Tenda AC21 16.03.08.16<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>A severe vulnerability has been identified in the Tenda AC21 software version 16.03.08.16 that exposes systems to potential compromise or data leakage. This cybersecurity threat, denoted as CVE-2025-10838, specifically affects the function sub_45BB10 of the file \/goform\/WifiExtraSet, leading to buffer overflow when the argument wpapsk_crypto is manipulated. Given the widespread use of Tenda AC21 in various network environments, this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-26210-deepseek-xss-vulnerability-allows-potential-system-compromise\/\"  data-wpil-monitor-id=\"86633\">vulnerability could potentially impact a large number of systems<\/a> and is, therefore, a critical concern for cybersecurity professionals.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-10838<br \/>\nSeverity: Critical (CVSS: 8.8)<br \/>\nAttack Vector: Remote<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: Potential <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49401-critical-deserialization-of-untrusted-data-vulnerability-in-expresstech-systems-quiz-and-survey-master\/\"  data-wpil-monitor-id=\"87153\">system compromise or data<\/a> leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-4237043504\" 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>Tenda AC21 | 16.03.08.16<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of a buffer overflow <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-57148-arbitrary-file-upload-vulnerability-in-phpgurukul-online-shopping-portal-2-0\/\"  data-wpil-monitor-id=\"86577\">vulnerability in the Tenda AC21&#8217;s function sub_45BB10 of the file<\/a> \/goform\/WifiExtraSet. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53248-php-remote-file-inclusion-vulnerability-in-unfoldwp-magazine\/\"  data-wpil-monitor-id=\"86842\">vulnerability arises when an attacker remotely<\/a> manipulates the argument wpapsk_crypto, causing the program to write more data into the buffer than it can handle. This overflow can lead to system crashes, incorrect calculations, or even allow an attacker to execute <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47129-out-of-bounds-write-vulnerability-in-adobe-framemaker-with-potential-for-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"86897\">arbitrary code<\/a>, potentially leading to full system compromise.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2977340341\" 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>Consider the following conceptual HTTP <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-58833-cross-site-request-forgery-vulnerability-in-invelity-mygls-connect\/\"  data-wpil-monitor-id=\"86986\">request that an attacker might use to exploit this vulnerability<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/goform\/WifiExtraSet HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\nwpapsk_crypto=A_LONG_STRING_THAT_CAUSES_BUFFER_OVERFLOW<\/code><\/pre>\n<p>This request attempts to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47099-heap-based-buffer-overflow-vulnerability-in-incopy-leading-to-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"86794\">overflow the buffer<\/a> by sending a longer string than expected for the wpapsk_crypto argument. If the server is not properly protected, this could <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48539-critical-out-of-bounds-read-in-acl-arbiter-cc-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"87341\">lead to system<\/a> compromise or data leakage.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>To mitigate this vulnerability, users are advised to apply the vendor&#8217;s patch once it becomes available. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as temporary mitigation measures to protect the system from <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-36342-heap-overflow-vulnerability-in-gpu-driver-leading-to-potential-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"87458\">potential attacks exploiting this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview A severe vulnerability has been identified in the Tenda AC21 software version 16.03.08.16 that exposes systems to potential compromise or data leakage. This cybersecurity threat, denoted as CVE-2025-10838, specifically affects the function sub_45BB10 of the file \/goform\/WifiExtraSet, leading to buffer overflow when the argument wpapsk_crypto is manipulated. Given the widespread use of Tenda AC21 [&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-79369","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\/79369","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=79369"}],"version-history":[{"count":9,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/79369\/revisions"}],"predecessor-version":[{"id":80293,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/79369\/revisions\/80293"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=79369"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=79369"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=79369"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=79369"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=79369"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=79369"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=79369"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=79369"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=79369"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}