{"id":54406,"date":"2025-06-23T17:29:32","date_gmt":"2025-06-23T17:29:32","guid":{"rendered":""},"modified":"2025-10-05T23:20:39","modified_gmt":"2025-10-06T05:20:39","slug":"cve-2025-31919-deserialization-of-untrusted-data-vulnerability-in-themeton-spare","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-31919-deserialization-of-untrusted-data-vulnerability-in-themeton-spare\/","title":{"rendered":"<strong>CVE-2025-31919: Deserialization of Untrusted Data Vulnerability in Themeton Spare<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The Common Vulnerabilities and Exposures system (CVE) has identified a significant security flaw in the popular Themeton Spare software. This vulnerability, categorized as CVE-2025-31919, poses a serious risk to any systems running versions of Spare up to 1.7.<br \/>\nThe <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27818-critical-vulnerability-in-apache-kafka-enabling-java-deserialization-attacks\/\"  data-wpil-monitor-id=\"60686\">vulnerability revolves around the deserialization<\/a> of untrusted data, which can lead to Object Injection. If exploited, this could result in a full <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5866-critical-vulnerability-in-rt-thread-5-1-0-potentially-leading-to-system-compromise-or-data-leakage\/\"  data-wpil-monitor-id=\"63841\">system compromise or data<\/a> leakage. Given the widespread use of Themeton Spare, this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9364-critical-open-database-issue-resulting-in-potential-system-compromise\/\"  data-wpil-monitor-id=\"89075\">issue demands immediate attention from system<\/a> administrators and security teams.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-31919<br \/>\nSeverity: Critical (9.8 CVSS Score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-40912-critical-vulnerability-in-cryptx-for-perl-allows-potential-system-compromise\/\"  data-wpil-monitor-id=\"60805\">System compromise and potential<\/a> data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-853138641\" 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>Themeton Spare | Up to 1.7<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49154-insecure-access-control-vulnerability-in-trend-micro-products\/\"  data-wpil-monitor-id=\"62732\">vulnerability is based on the software&#8217;s insecure<\/a> handling of serialized or &#8220;flattened&#8221; data. During the deserialization process, the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6573-critical-kernel-software-vulnerability-leading-to-potential-data-leakage\/\"  data-wpil-monitor-id=\"80158\">software fails to properly validate or sanitize the incoming data<\/a>. This allows an attacker to inject malicious objects into the data stream, which are then executed when the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49455-critical-deserialization-of-untrusted-data-vulnerability-in-loftocean-tinysalt\/\"  data-wpil-monitor-id=\"60738\">data is deserialized<\/a>.<br \/>\nAn attacker can exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-33064-heap-based-buffer-overflow-vulnerability-in-windows-routing-and-remote-access-service-rras\/\"  data-wpil-monitor-id=\"60844\">vulnerability remotely<\/a>, over the network, without requiring any special privileges or user interaction. If successfully exploited, the attacker gains <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-33073-windows-smb-improper-access-control-vulnerability\/\"  data-wpil-monitor-id=\"61065\">control of the system and may also gain access<\/a> to sensitive data.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-1039902985\" 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>The following is a conceptual example of how an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5353-local-authenticated-attacker-exploit-in-ivanti-workspace-control\/\"  data-wpil-monitor-id=\"60916\">attacker might exploit<\/a> this vulnerability. This is not an actual exploit code, but rather a demonstration of the type of malicious payload that could be used.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/deserialization-endpoint HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ &quot;serialized_object&quot;: &quot;rO0ABXNyADJjb20udGhlbWV0b24uc3BhcmUuRXhhbXBsZU9iamVjdEV4cGxvaXQAAAAAAAAAAQIAAHhyADFjb20udGhlbWV0b24uc3BhcmUuRXhhbXBsZU9iamVjdAAAAAAAAAABAgAAeHAAAAAA=&quot; }<\/code><\/pre>\n<p>In this example, the &#8220;serialized_object&#8221; field contains a Base64-encoded serialized object that includes <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8714-critical-postgresql-vulnerability-allowing-malicious-code-injection-by-superusers\/\"  data-wpil-monitor-id=\"80726\">malicious code<\/a>. When the server deserializes this object, the malicious <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47163-unauthorized-code-execution-through-microsoft-sharepoint-deserialization-vulnerability\/\"  data-wpil-monitor-id=\"60964\">code is executed<\/a>, leading to a potential system compromise.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>Until a patch is available from the vendor, security teams are advised to implement a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45984-critical-command-injection-vulnerability-detected-in-blink-routers\/\"  data-wpil-monitor-id=\"62733\">detect and block attempts to exploit this vulnerability<\/a>. These <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5978-critical-vulnerability-in-tenda-fh1202-1-2-0-14-potentially-leading-to-system-compromise\/\"  data-wpil-monitor-id=\"61035\">systems can be configured to identify and stop potentially<\/a> malicious deserialization operations, providing a temporary mitigation for this issue.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The Common Vulnerabilities and Exposures system (CVE) has identified a significant security flaw in the popular Themeton Spare software. This vulnerability, categorized as CVE-2025-31919, poses a serious risk to any systems running versions of Spare up to 1.7. The vulnerability revolves around the deserialization of untrusted data, which can lead to Object Injection. If [&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":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-54406","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/54406","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=54406"}],"version-history":[{"count":13,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/54406\/revisions"}],"predecessor-version":[{"id":81897,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/54406\/revisions\/81897"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=54406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=54406"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=54406"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=54406"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=54406"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=54406"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=54406"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=54406"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=54406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}