{"id":53321,"date":"2025-06-18T11:32:25","date_gmt":"2025-06-18T11:32:25","guid":{"rendered":""},"modified":"2025-07-05T17:20:20","modified_gmt":"2025-07-05T23:20:20","slug":"cve-2025-5969-critical-stack-based-buffer-overflow-vulnerability-in-d-link-dir-632-fw103b08","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-5969-critical-stack-based-buffer-overflow-vulnerability-in-d-link-dir-632-fw103b08\/","title":{"rendered":"<strong>CVE-2025-5969: Critical Stack-Based Buffer Overflow Vulnerability in D-Link DIR-632 FW103B08<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity landscape is constantly evolving, and a new vulnerability, classified as critical, has been identified in the D-Link DIR-632 FW103B08. This vulnerability, identified as CVE-2025-5969, affects an unsupported product, increasing the risk for users who are still using it. Given the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-30220-high-severity-xml-external-entity-xxe-vulnerability-in-geoserver-geotools-and-geonetwork\/\"  data-wpil-monitor-id=\"60602\">severity of this vulnerability<\/a>, it is important to understand its implications, who it affects, and how it can be mitigated. This vulnerability is significant due to its <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31222-potential-privilege-elevation-and-system-compromise-vulnerability\/\"  data-wpil-monitor-id=\"59690\">potential for system compromise<\/a> and data leakage, and the fact that it can be exploited remotely, increasing the pool of potential attackers.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-5969<br \/>\nSeverity: Critical &#8211; CVSS Severity Score: 8.8<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-21475-critical-memory-corruption-vulnerability-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"59911\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3640098431\" 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-2025-5912-critical-stack-based-buffer-overflow-in-d-link-dir-632-fw103b08\/\"  data-wpil-monitor-id=\"60696\">D-Link DIR-632<\/a> FW103B08 | All versions<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5619-critical-remote-buffer-overflow-vulnerability-in-tenda-ch22-1-0-0-1\/\"  data-wpil-monitor-id=\"59777\">vulnerability is a stack-based buffer overflow<\/a> issue found in the function FUN_00425fd8 of the file \/biurl_grou of the HTTP POST Request Handler. An attacker can exploit this vulnerability by sending a specially crafted HTTP POST request to the affected device, which will cause an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5685-critical-stack-based-buffer-overflow-vulnerability-in-tenda-ch22-1-0-0-1\/\"  data-wpil-monitor-id=\"59784\">overflow in the stack buffer<\/a>. This overflow can allow the attacker to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3835-remote-code-execution-vulnerability-in-zohocorp-manageengine-exchange-reporter-plus\/\"  data-wpil-monitor-id=\"59859\">execute arbitrary code<\/a> on the device, thus compromising the system and potentially leading to data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3264374570\" 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 an example of a malicious <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5739-critical-buffer-overflow-vulnerability-in-totolink-x15-http-post-request-handler\/\"  data-wpil-monitor-id=\"59802\">HTTP POST request<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/biurl_grou HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/x-www-form-urlencoded\ndata=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA...<\/code><\/pre>\n<p>In this example, the &#8216;data&#8217; parameter is filled with an excessive number of characters (&#8216;A&#8217; in this case), causing a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5736-critical-buffer-overflow-vulnerability-in-totolink-x15\/\"  data-wpil-monitor-id=\"59786\">buffer overflow<\/a>.<\/p>\n<p><strong>Recommended Mitigation<\/strong><\/p>\n<p>Mitigation of this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50213-special-element-injection-vulnerability-in-apache-airflow-providers-snowflake\/\"  data-wpil-monitor-id=\"64019\">vulnerability involves applying the patch provided<\/a> by the vendor. However, since the product is no longer supported by the maintainer, users of the affected product are strongly recommended to upgrade to a supported version. As a temporary mitigation, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45984-critical-command-injection-vulnerability-detected-in-blink-routers\/\"  data-wpil-monitor-id=\"61371\">detect and block attempts to exploit this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity landscape is constantly evolving, and a new vulnerability, classified as critical, has been identified in the D-Link DIR-632 FW103B08. This vulnerability, identified as CVE-2025-5969, affects an unsupported product, increasing the risk for users who are still using it. Given the severity of this vulnerability, it is important to understand its implications, who [&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-53321","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\/53321","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=53321"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/53321\/revisions"}],"predecessor-version":[{"id":57564,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/53321\/revisions\/57564"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=53321"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=53321"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=53321"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=53321"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=53321"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=53321"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=53321"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=53321"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=53321"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}