{"id":34490,"date":"2025-05-04T23:05:19","date_gmt":"2025-05-04T23:05:19","guid":{"rendered":""},"modified":"2025-09-12T05:18:18","modified_gmt":"2025-09-12T11:18:18","slug":"cve-2021-42028-critical-vulnerability-in-syngo-fastview-allowing-remote-code-execution","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2021-42028-critical-vulnerability-in-syngo-fastview-allowing-remote-code-execution\/","title":{"rendered":"<strong>CVE-2021-42028: Critical Vulnerability in syngo fastView Allowing Remote Code Execution<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity world is once again threatened by a newly discovered vulnerability, CVE-2021-42028, that targets the popular application, syngo fastView. This vulnerability affects all versions of the application and opens up a potential pathway for attackers to execute code within the context of the current process, posing a significant risk to system integrity and data security.<br \/>\nConsidered a critical flaw with a CVSS severity score of 7.8, it is a matter of urgency for all users of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-2594-critical-vulnerability-in-user-registration-membership-wordpress-plugin\/\"  data-wpil-monitor-id=\"40472\">syngo fastView<\/a> to understand the implications of this vulnerability, the risks it presents, and the steps needed to mitigate its impact. This blog post aims to provide a <a href=\"https:\/\/www.ameeba.com\/blog\/the-intersection-of-electric-vehicles-trade-tariffs-and-cybersecurity-a-comprehensive-analysis\/\"  data-wpil-monitor-id=\"39002\">comprehensive breakdown of this significant cybersecurity<\/a> issue and provide practical guidance for its mitigation.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2021-42028<br \/>\nSeverity: Critical (CVSS 7.8)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32849-vulnerability-in-telecontrol-server-basic-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"39588\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1918297904\" 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-2021-40367-critical-vulnerability-in-syngo-fastview-allows-potential-system-compromise\/\"  data-wpil-monitor-id=\"40918\">syngo fastView<\/a> | All versions<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32843-sql-injection-vulnerability-in-telecontrol-server-basic-leading-to-authorization-bypass-and-data-manipulation\/\"  data-wpil-monitor-id=\"39064\">vulnerability lies in the way syngo fastView validates user-supplied data<\/a> when parsing BMP files. An attacker could craft a malicious BMP file that, when processed by the application, causes an <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2023-34436-critical-out-of-bounds-write-vulnerability-in-gtkwave-3-3-115\/\"  data-wpil-monitor-id=\"41043\">out-of-bounds write<\/a> past the end of an allocated structure.<br \/>\nThis condition can lead to a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-28024-buffer-overflow-vulnerability-in-totolink-a810r-v4-1-2cu-5182-b20201026\/\"  data-wpil-monitor-id=\"39587\">buffer overflow<\/a>, a classic memory corruption issue, which can be exploited to execute arbitrary code. The code would run in the context of the current process, which could <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32857-sql-injection-vulnerability-in-telecontrol-server-basic-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"39776\">lead to a complete system<\/a> compromise if the process runs with high privileges.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2158684492\" 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 we won&#8217;t provide a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6427-bypassing-connect-src-directive-of-content-security-policy-in-firefox\/\"  data-wpil-monitor-id=\"65351\">direct exploit code for ethical and security<\/a> reasons, we can illustrate the concept with a pseudocode:<\/p>\n<pre><code class=\"\" data-line=\"\"># Pseudocode\ndef exploit(target):\nbmp_file = create_malicious_bmp()\nsend_bmp_to_target(target, bmp_file)\ndef create_malicious_bmp():\n# Create a BMP file with malicious payload which causes buffer overflow\nbmp_file = BMPFile()\nbmp_file.add_malicious_payload()\nreturn bmp_file\ndef send_bmp_to_target(target, bmp_file):\n# Send the BMP file to the target\ntarget.receive_bmp(bmp_file)<\/code><\/pre>\n<p>In simple terms, the attacker creates a malicious BMP file that causes a <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3619-critical-heap-buffer-overflow-vulnerability-in-google-chrome-codecs\/\"  data-wpil-monitor-id=\"40072\">buffer overflow<\/a> when processed by syngo fastView. The attacker then sends this malicious BMP <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52732-php-remote-file-inclusion-vulnerability-in-google-map-targeting-plugin\/\"  data-wpil-monitor-id=\"81939\">file to the target<\/a>, which, when opened, executes the malicious payload.<br \/>\nRemember, this is a simplified explanation to help understand the exploit process. Actual exploits could be much more complex and involve advanced techniques to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-41232-spring-security-aspects-authorization-bypass-vulnerability\/\"  data-wpil-monitor-id=\"52959\">bypass security<\/a> measures.<\/p>\n<p><strong>Mitigation Guidance<\/strong><\/p>\n<p>Users are advised to apply the latest patches provided by the vendor. In the absence of a patch, or where patching is not immediately feasible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) could serve as a temporary mitigation. These tools can help detect and block <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-1277-memory-corruption-vulnerability-in-autodesk-applications-through-malicious-pdf-files\/\"  data-wpil-monitor-id=\"65352\">malicious payloads before they reach the application<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity world is once again threatened by a newly discovered vulnerability, CVE-2021-42028, that targets the popular application, syngo fastView. This vulnerability affects all versions of the application and opens up a potential pathway for attackers to execute code within the context of the current process, posing a significant risk to system integrity and [&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":[86,80],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-34490","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-buffer-overflow","attack_vector-rce"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/34490","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=34490"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/34490\/revisions"}],"predecessor-version":[{"id":74402,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/34490\/revisions\/74402"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=34490"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=34490"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=34490"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=34490"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=34490"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=34490"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=34490"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=34490"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=34490"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}