{"id":41057,"date":"2025-05-20T15:47:54","date_gmt":"2025-05-20T15:47:54","guid":{"rendered":""},"modified":"2025-05-30T17:30:25","modified_gmt":"2025-05-30T23:30:25","slug":"cve-2025-40566-severe-user-session-vulnerability-in-simatic-pcs-neo-products","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-40566-severe-user-session-vulnerability-in-simatic-pcs-neo-products\/","title":{"rendered":"<strong>CVE-2025-40566: Severe User Session Vulnerability in SIMATIC PCS neo Products<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>In the ever-evolving world of cybersecurity, vulnerabilities are constantly being discovered and patched. One such vulnerability, identified as CVE-2025-40566, has been found in Siemens&#8217; SIMATIC PCS neo V4.1 and SIMATIC PCS neo V5.0 products. The severity of this vulnerability, coupled with its potential to compromise systems and leak sensitive data, has put the <a href=\"https:\/\/www.ameeba.com\/blog\/google-s-cybersecurity-alert-us-retailers-in-the-crosshairs-of-uk-attackers\/\"  data-wpil-monitor-id=\"46915\">cybersecurity community on high alert<\/a>. This blog post aims to provide an <a href=\"https:\/\/www.ameeba.com\/blog\/enisa-unveils-european-vulnerability-database-an-in-depth-look-into-the-cybersecurity-landscape\/\"  data-wpil-monitor-id=\"46304\">in-depth understanding of the vulnerability<\/a>, its potential impact, and how to mitigate it effectively.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-40566<br \/>\nSeverity: High (8.8 CVSS score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: None<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-39401-unrestricted-file-upload-leading-to-potential-system-compromise-in-mojoomla-wpams\/\"  data-wpil-monitor-id=\"52174\">System compromise<\/a> and data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1538620885\" 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-2025-40795-critical-buffer-overflow-vulnerability-in-simatic-pcs-neo-and-umc\/\"  data-wpil-monitor-id=\"88973\">SIMATIC PCS neo<\/a> V4.1 | All versions < V4.1 Update 3\nSIMATIC PCS neo V5.0 | All versions < V5.0 Update 1\n\n<strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-41450-improper-authentication-vulnerability-in-danfoss-aksm8xxa-series\/\"  data-wpil-monitor-id=\"46782\">vulnerability lies in the improper<\/a> invalidation of user sessions upon logout. In a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-46916-critical-vulnerability-in-diebold-nixdorf-vynamic-security-suite-allows-system-compromise\/\"  data-wpil-monitor-id=\"88974\">secure system<\/a>, a user&#8217;s session should be invalidated or destroyed as soon as they log out. However, in the affected versions of SIMATIC PCS neo, the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-46827-graylog-open-log-management-platform-user-session-cookie-exposure\/\"  data-wpil-monitor-id=\"47623\">user&#8217;s session<\/a> remains active even after logout. This means that an attacker who has somehow obtained the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47269-session-token-exposure-in-code-server-prior-to-version-4-99-4\/\"  data-wpil-monitor-id=\"46741\">session token<\/a> can re-use a legitimate user&#8217;s session. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47732-a-critical-remote-code-execution-vulnerability-in-microsoft-dataverse\/\"  data-wpil-monitor-id=\"46303\">vulnerability could be exploited by a remote<\/a> unauthenticated attacker, leading to potential system compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p>\n<p>Here 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=\"88975\">attacker might exploit<\/a> this vulnerability. An attacker could intercept a valid <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31214-a-critical-network-traffic-interception-vulnerability-in-ios-and-ipados\/\"  data-wpil-monitor-id=\"47691\">session<\/a> token and use it to send a malicious request to a vulnerable endpoint:<\/p><div id=\"ameeb-927736672\" 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<pre><code class=\"\" data-line=\"\">GET \/sensitive\/data HTTP\/1.1\nHost: target.example.com\nCookie: sessionid=valid_session_token_obtained_by_attacker<\/code><\/pre>\n<p>In this example, the attacker uses the valid <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2022-3604-data-validation-vulnerability-in-contact-form-entries-wordpress-plugin\/\"  data-wpil-monitor-id=\"52173\">session<\/a> token to send a GET request to a sensitive data endpoint. Since the session token is still valid, even after the legitimate user has logged out, the attacker can gain <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-45746-unauthorized-system-access-via-hardcoded-jwt-secret-in-zkt-zkbio-cvsecurity\/\"  data-wpil-monitor-id=\"48946\">unauthorized access<\/a> to the sensitive data.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>Users of affected versions of SIMATIC PCS neo are advised to apply the vendor-provided patch immediately. The patch ensures that user sessions are invalidated upon logout, thus closing the vulnerability. For those unable to apply the patch immediately, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. These systems can monitor and block suspicious activities, such as the re-use of session tokens. Nonetheless, these are only temporary solutions and applying the vendor patch is the most effective way to secure the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-20698-windows-kernel-elevation-of-privilege-vulnerability-a-threat-to-system-security\/\"  data-wpil-monitor-id=\"47214\">system against this vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview In the ever-evolving world of cybersecurity, vulnerabilities are constantly being discovered and patched. One such vulnerability, identified as CVE-2025-40566, has been found in Siemens&#8217; SIMATIC PCS neo V4.1 and SIMATIC PCS neo V5.0 products. The severity of this vulnerability, coupled with its potential to compromise systems and leak sensitive data, has put the cybersecurity [&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-41057","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\/41057","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=41057"}],"version-history":[{"count":10,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/41057\/revisions"}],"predecessor-version":[{"id":81794,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/41057\/revisions\/81794"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=41057"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=41057"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=41057"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=41057"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=41057"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=41057"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=41057"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=41057"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=41057"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}