{"id":75956,"date":"2025-09-17T18:44:17","date_gmt":"2025-09-17T18:44:17","guid":{"rendered":""},"modified":"2025-10-28T12:51:08","modified_gmt":"2025-10-28T18:51:08","slug":"cve-2025-27466-critical-vulnerability-in-guest-memory-pages-handling-in-viridian-code","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-27466-critical-vulnerability-in-guest-memory-pages-handling-in-viridian-code\/","title":{"rendered":"<strong>CVE-2025-27466: Critical Vulnerability in Guest Memory Pages Handling in Viridian Code<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>CVE-2025-27466 is a critical vulnerability found within the handling and accessing of guest memory pages in the viridian code. It pertains to a NULL pointer dereference in the updating of the reference TSC area. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50972-sql-injection-vulnerability-in-abantecart-1-4-2-with-a-high-severity-score\/\"  data-wpil-monitor-id=\"83540\">vulnerability has a CVSS severity<\/a> score of 9.8, representing a very high severity level, thereby causing a significant threat to organizations using the affected software. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-7775-critical-memory-overflow-vulnerability-in-netscaler-adc-and-gateway-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"83692\">vulnerability could lead to potential system<\/a> compromise or data leakage, which could have devastating consequences for businesses and their customers.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-27466<br \/>\nSeverity: Critical (9.8 CVSS)<br \/>\nAttack Vector: Local<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9253-stack-based-buffer-overflow-on-linksys-wi-fi-range-extenders-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"84278\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-730473753\" 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>Viridian <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49531-arbitrary-code-execution-vulnerability-in-illustrator-versions-28-7-6-29-5-1-and-earlier\/\"  data-wpil-monitor-id=\"86199\">Code | All versions<\/a> prior to the patch<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of a NULL pointer dereference in the updating of the reference TSC area in the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43545-uninitialized-pointer-vulnerability-in-bridge-could-lead-to-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"91711\">viridian<\/a> code. By specifically crafting a series of commands, an attacker can cause the system to attempt to reference a location that it shouldn&#8217;t, leading to a system crash or, in more severe scenarios, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-0074-critical-remote-code-execution-vulnerability-in-sdp-discovery\/\"  data-wpil-monitor-id=\"83618\">execution of arbitrary code<\/a>.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2645988959\" 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>While actual exploit code is beyond the scope of this article, the following pseudocode illustrates the core concept of exploiting a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-58142-critical-null-pointer-dereference-vulnerability-in-viridian-code\/\"  data-wpil-monitor-id=\"89605\">NULL pointer dereference<\/a>:<\/p>\n<pre><code class=\"\" data-line=\"\">#include &lt;stdio.h&gt;\nint main(){\nint *ptr = NULL;\nprintf(&quot;The value of ptr is : %x\\n&quot;, ptr);\n\/* Attempt to access a memory location through the null pointer *\/\nprintf(&quot;The value of *ptr is : %d\\n&quot;, *ptr);\nreturn 0;\n}<\/code><\/pre>\n<p>In this example, the pointer is initialized to NULL, and then the program attempts to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49529-access-of-uninitialized-pointer-vulnerability-in-adobe-illustrator\/\"  data-wpil-monitor-id=\"86211\">access a memory location through the null pointer<\/a>. In the context of the CVE-2025-27466 vulnerability, an attacker could manipulate such a scenario to make the system behave unpredictably or to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-22403-remote-code-execution-vulnerability-in-sdp-discovery-cc\/\"  data-wpil-monitor-id=\"83930\">execute code<\/a> of their choosing.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>The most effective way to protect against CVE-2025-27466 is to apply the vendor&#8217;s patch. If this isn&#8217;t immediately possible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can offer temporary mitigation by detecting and blocking exploit attempts.<br \/>\nAs a broader measure, organizations should maintain a robust patching policy, ensuring that all <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-23283-critical-vulnerability-in-nvidia-vgpu-software-for-linux-style-hypervisors\/\"  data-wpil-monitor-id=\"89564\">software is kept up-to-date to protect against known vulnerabilities<\/a>. Regular security assessments and penetration tests can also help identify potential weaknesses before they can be exploited.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview CVE-2025-27466 is a critical vulnerability found within the handling and accessing of guest memory pages in the viridian code. It pertains to a NULL pointer dereference in the updating of the reference TSC area. This vulnerability has a CVSS severity score of 9.8, representing a very high severity level, thereby causing a significant threat [&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-75956","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\/75956","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=75956"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/75956\/revisions"}],"predecessor-version":[{"id":84880,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/75956\/revisions\/84880"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=75956"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=75956"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=75956"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=75956"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=75956"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=75956"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=75956"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=75956"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=75956"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}