{"id":51103,"date":"2025-06-11T08:23:30","date_gmt":"2025-06-11T08:23:30","guid":{"rendered":""},"modified":"2025-10-22T21:12:50","modified_gmt":"2025-10-23T03:12:50","slug":"cve-2025-5623-a-critical-stack-based-buffer-overflow-vulnerability-in-d-link-dir-816-1-10cnb05","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-5623-a-critical-stack-based-buffer-overflow-vulnerability-in-d-link-dir-816-1-10cnb05\/","title":{"rendered":"<strong>CVE-2025-5623: A Critical Stack-based Buffer Overflow Vulnerability in D-Link DIR-816 1.10CNB05<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In the ever-growing world of cybersecurity threats, a new vulnerability has emerged that is shaking the foundations of outdated network devices. The CVE-2025-5623 is a severe vulnerability identified in D-Link DIR-816 1.10CNB05, a product which is no longer supported by the manufacturer, making it a prime target for cybercriminals. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32286-critical-php-remote-file-inclusion-vulnerability-in-apustheme-butcher\/\"  data-wpil-monitor-id=\"57322\">vulnerability exploits the &#8216;qosClassifier&#8217; function of the file<\/a> &#8216;\/goform\/qosClassifier. It is classified as <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-45564-critical-memory-corruption-vulnerability-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"58138\">critical due to its severe impact potential<\/a> and the ease of its exploitation.<br \/>\nThe primary concern regarding this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49113-critical-vulnerability-in-roundcube-webmail-allows-remote-code-execution\/\"  data-wpil-monitor-id=\"58344\">vulnerability is that the attack can be initiated remotely<\/a>, making any device with an internet connection a potential target. The disclosure of the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-41672-critical-cybersecurity-threat-exploiting-default-certificates\/\"  data-wpil-monitor-id=\"91261\">exploit to the public further amplifies its threat<\/a> level. It&#8217;s a race against time for <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-41591-critical-man-in-the-middle-vulnerability-in-open-network-foundation-onos-v2-7-0\/\"  data-wpil-monitor-id=\"57304\">network administrators and users to mitigate this vulnerability<\/a> before falling victim to a potential system compromise or data leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-5623<br \/>\nSeverity: Critical (CVSS 9.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-22041-linux-kernel-vulnerability-in-ksmbd-sessions-deregister-may-lead-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"57953\">Potential system<\/a> compromise and data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2691913093\" 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-2025-5624-critical-stack-based-buffer-overflow-vulnerability-in-d-link-dir-816-1-10cnb05\/\"  data-wpil-monitor-id=\"59214\">D-Link DIR-816<\/a> | 1.10CNB05<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of a stack-based buffer <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-1273-heap-based-overflow-vulnerability-in-autodesk-applications\/\"  data-wpil-monitor-id=\"57318\">overflow vulnerability<\/a> within the &#8216;qosClassifier&#8217; function of the file &#8216;\/goform\/qosClassifier. It involves the manipulation of the &#8216;dip_address&#8217; or &#8216;sip_address&#8217; argument, causing an excessive amount of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-45565-memory-corruption-vulnerability-leading-to-potential-system-compromise-or-data-leakage\/\"  data-wpil-monitor-id=\"58139\">data to be loaded into the stack memory<\/a>, triggering a stack overflow. As a result, an attacker can execute arbitrary code or cause a denial of service, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2021-47668-linux-kernel-vulnerability-leading-to-potential-system-compromise-or-data-leakage\/\"  data-wpil-monitor-id=\"57537\">potentially leading to system compromise or data<\/a> leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2290945197\" 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 simplified <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5671-critical-buffer-overflow-vulnerability-in-totolink-n302r-plus-http-post-request-handler\/\"  data-wpil-monitor-id=\"59505\">HTTP request<\/a> that shows how an attacker might overload the &#8216;dip_address&#8217; or &#8216;sip_address&#8217; value with excessive data.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/goform\/qosClassifier HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\ndip_address=AAAAAAAA...[long string of As]...<\/code><\/pre>\n<p>Note: The above is a conceptual representation and may not accurately reflect the actual code used in an attack.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>While the ideal solution is to apply the vendor <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49002-critical-vulnerability-in-dataease-bypassing-patch-for-cve-2025-32966\/\"  data-wpil-monitor-id=\"58916\">patch for this vulnerability<\/a>, it is important to note that D-Link no longer supports the affected product. As a temporary mitigation, utilising Web Application Firewall (WAF) or Intrusion Detection System (IDS) can help to detect and prevent exploit attempts. However, considering the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-37093-severe-authentication-bypass-vulnerability-in-hpe-storeonce-software\/\"  data-wpil-monitor-id=\"57952\">severity and potential impact of this vulnerability<\/a>, users are strongly recommended to upgrade their network devices to models that are currently supported and regularly updated by the vendor.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In the ever-growing world of cybersecurity threats, a new vulnerability has emerged that is shaking the foundations of outdated network devices. The CVE-2025-5623 is a severe vulnerability identified in D-Link DIR-816 1.10CNB05, a product which is no longer supported by the manufacturer, making it a prime target for cybercriminals. This vulnerability exploits the &#8216;qosClassifier&#8217; [&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-51103","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\/51103","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=51103"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/51103\/revisions"}],"predecessor-version":[{"id":84290,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/51103\/revisions\/84290"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=51103"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=51103"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=51103"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=51103"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=51103"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=51103"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=51103"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=51103"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=51103"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}