{"id":57778,"date":"2025-07-06T01:36:29","date_gmt":"2025-07-06T01:36:29","guid":{"rendered":""},"modified":"2025-10-03T12:32:33","modified_gmt":"2025-10-03T18:32:33","slug":"cve-2025-45931-critical-remote-code-execution-vulnerability-in-d-link-dir-816-a2","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-45931-critical-remote-code-execution-vulnerability-in-d-link-dir-816-a2\/","title":{"rendered":"<strong>CVE-2025-45931: Critical Remote Code Execution Vulnerability in D-Link DIR-816-A2<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In the ever-evolving landscape of cyber threats, a new vulnerability has been discovered that could potentially compromise systems and lead to data leakage. This vulnerability, dubbed CVE-2025-45931, affects the D-Link DIR-816-A2 router. More specifically, it is found in the DIR-816A2_FWv1.10CNB05_R1B011D88210 firmware of the device. This vulnerability poses a serious risk as it allows <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6426-executable-file-warning-vulnerability-in-firefox-for-macos\/\"  data-wpil-monitor-id=\"64295\">remote<\/a> attackers to execute arbitrary code, potentially leading to system compromise or data leakage.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-45931<br \/>\nSeverity: Critical (9.8\/10 on CVSS)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: System compromise, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3090-unauthenticated-remote-attack-leading-to-potential-data-leakage-and-system-compromise\/\"  data-wpil-monitor-id=\"64580\">potential data leakage<\/a><\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-2434267048\" 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>D-Link DIR-816-A2 | FWv1.10CNB05_R1B011D88210<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32977-unauthenticated-backup-file-upload-vulnerability-in-quest-kace-systems-management-appliance\/\"  data-wpil-monitor-id=\"64433\">vulnerability is present in the `bin\/goahead` file<\/a> of the affected D-Link firmware. This file <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52890-critical-acl-bypass-vulnerability-in-incus-system-container-and-virtual-machine-manager\/\"  data-wpil-monitor-id=\"64724\">contains<\/a> a `system()` function that can be exploited by a remote attacker. By sending a carefully crafted request, an attacker can inject malicious <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-36038-remote-code-execution-vulnerability-in-ibm-websphere-application-server\/\"  data-wpil-monitor-id=\"64663\">code that the system function will execute<\/a>. Since the system function runs with elevated privileges, this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20281-critical-vulnerability-in-cisco-ise-and-ise-pic-apis-allows-remote-code-execution\/\"  data-wpil-monitor-id=\"64579\">allows the attacker to execute arbitrary code<\/a> with similar elevated privileges.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2814690311\" 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. In this case, the attacker sends a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8714-critical-postgresql-vulnerability-allowing-malicious-code-injection-by-superusers\/\"  data-wpil-monitor-id=\"80635\">malicious payload to a vulnerable<\/a> endpoint on the router.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/cgi-bin\/goahead HTTP\/1.1\nHost: target_router_ip\nContent-Type: application\/x-www-form-urlencoded\ncmd=system(&quot;malicious_command&quot;)<\/code><\/pre>\n<p>In the above example, `cmd=system(&#8220;malicious_command&#8221;)` is the malicious payload. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-29970-microsoft-brokering-file-system-privilege-escalation-vulnerability\/\"  data-wpil-monitor-id=\"65064\">system function executes the `malicious_command` with elevated privileges<\/a>, which could lead to various adverse impacts, such as unauthorized system access, data theft, or further propagation of the attack.<\/p>\n<p><strong>Mitigation Steps<\/strong><\/p>\n<p>The most effective way to mitigate this vulnerability is by applying the vendor-provided patch. D-Link has released a firmware update that addresses this issue. Users of the affected routers are strongly advised to update their firmware as soon as possible.<br \/>\nIn addition to the patch, users can also put up additional protection layers, such as Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS), as temporary mitigation. These protections could help in detecting and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8059-critical-privilege-escalation-vulnerability-in-b-blocks-wordpress-plugin\/\"  data-wpil-monitor-id=\"76428\">blocking attempts to exploit this vulnerability<\/a>. However, they are not a substitute for the official patch and should only be seen as supplementary measures.<br \/>\nRemember, staying updated is key in <a href=\"https:\/\/www.ameeba.com\/blog\/introducing-the-ameeba-cybersecurity-group-chat\/\"  data-wpil-monitor-id=\"88427\">cybersecurity<\/a>. Keep your firmware and software up-to-date to protect your <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6435-firefox-vulnerability-leading-to-potential-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"64825\">systems and data from potential<\/a> threats.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In the ever-evolving landscape of cyber threats, a new vulnerability has been discovered that could potentially compromise systems and lead to data leakage. This vulnerability, dubbed CVE-2025-45931, affects the D-Link DIR-816-A2 router. More specifically, it is found in the DIR-816A2_FWv1.10CNB05_R1B011D88210 firmware of the device. This vulnerability poses a serious risk as it allows remote [&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":[80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-57778","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-rce"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/57778","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=57778"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/57778\/revisions"}],"predecessor-version":[{"id":81237,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/57778\/revisions\/81237"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=57778"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=57778"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=57778"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=57778"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=57778"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=57778"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=57778"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=57778"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=57778"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}