{"id":71660,"date":"2025-09-06T00:58:13","date_gmt":"2025-09-06T00:58:13","guid":{"rendered":""},"modified":"2025-09-12T17:54:45","modified_gmt":"2025-09-12T23:54:45","slug":"cve-2025-20704-remote-privilege-escalation-vulnerability-in-modem","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-20704-remote-privilege-escalation-vulnerability-in-modem\/","title":{"rendered":"<strong>CVE-2025-20704: Remote Privilege Escalation Vulnerability in Modem<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>This blog post delves into the details of a critical vulnerability, CVE-2025-20704, that has been identified in Modems. This vulnerability could potentially lead to a remote escalation of privilege, putting at risk any system or device that uses the affected Modem. Due to the severity of this issue and its <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55731-sql-injection-vulnerability-in-frappe-framework-leading-to-potential-data-leakage\/\"  data-wpil-monitor-id=\"79281\">potential for system compromise or data<\/a> leakage, understanding this vulnerability, how it can be exploited, and how to mitigate it is crucial for cybersecurity professionals, IT administrators, and anyone responsible for maintaining the secure operation of connected devices.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-20704<br \/>\nSeverity: High &#8211; CVSS score of 8.8<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-42957-critical-backdoor-vulnerability-in-sap-s-4hana-exposes-systems-to-potential-compromise\/\"  data-wpil-monitor-id=\"79601\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3136730978\" 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>Modem | All versions before patch MOLY01516959<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The CVE-2025-20704 <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31713-a-potential-privilege-escalation-vulnerability-due-to-command-injection\/\"  data-wpil-monitor-id=\"79461\">vulnerability is caused due<\/a> to a missing bounds check in the Modem, which can lead to an out of bounds write. This flaw can be exploited by an attacker who controls a rogue base station to which a UE (User Equipment) has connected. Once the UE is <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-24285-command-injection-vulnerability-in-unifi-connect-ev-station-lite\/\"  data-wpil-monitor-id=\"81735\">connected to the rogue base station<\/a>, the attacker can manipulate the data sent to the Modem, causing the Modem to write data outside of its allocated memory space. This could result in a remote <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55282-privilege-escalation-vulnerability-in-aiven-database-migration-tool\/\"  data-wpil-monitor-id=\"79330\">escalation of privilege<\/a> without the need for any additional execution privileges.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1535742303\" 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>Let&#8217;s consider a hypothetical scenario where an attacker has set up a rogue base <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27214-missing-authentication-for-critical-function-vulnerability-in-unifi-connect-ev-station-pro\/\"  data-wpil-monitor-id=\"82105\">station and a UE has connected<\/a> to it. The attacker could send malicious payload to the Modem that looks something like this:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/modem\/interface HTTP\/1.1\nHost: rogue.base.station\nContent-Type: application\/octet-stream\n{ &quot;data&quot;: &quot;malicious_data_that_causes_out_of_bounds_write&quot; }<\/code><\/pre>\n<p>This conceptual example is a gross simplification and actual attacks are likely to be more complex. But it illustrates the basic idea of how an attacker might exploit this vulnerability.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>The most effective way to mitigate this vulnerability is to apply the vendor-provided patch (Patch ID: MOLY01516959). It is strongly recommended to test the patch in a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53763-improper-access-control-in-azure-databricks-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"79816\">controlled environment before deploying it into production systems<\/a> to ensure it does not disrupt normal operations.<br \/>\nFor those who are not able to immediately apply the patch, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These security <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-40920-weak-cryptographic-source-in-data-uuid-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"79853\">systems can be configured to detect and block potentially<\/a> malicious traffic that attempts to exploit this vulnerability.<br \/>\nThe discovery of CVE-2025-20704 serves as a reminder of the importance of implementing a rigorous <a href=\"https:\/\/www.ameeba.com\/blog\/introducing-the-ameeba-cybersecurity-group-chat\/\"  data-wpil-monitor-id=\"88522\">cybersecurity<\/a> strategy that includes regular patching and updates, as well as proactive monitoring for unusual network activity.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview This blog post delves into the details of a critical vulnerability, CVE-2025-20704, that has been identified in Modems. This vulnerability could potentially lead to a remote escalation of privilege, putting at risk any system or device that uses the affected Modem. Due to the severity of this issue and its potential for system compromise [&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":[76],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-71660","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-privilege-escalation"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/71660","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=71660"}],"version-history":[{"count":9,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/71660\/revisions"}],"predecessor-version":[{"id":81328,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/71660\/revisions\/81328"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=71660"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=71660"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=71660"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=71660"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=71660"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=71660"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=71660"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=71660"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=71660"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}