{"id":86323,"date":"2026-01-19T09:55:29","date_gmt":"2026-01-19T09:55:29","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T00:00:00","slug":"cve-2025-1948-eclipse-jetty-http-2-server-memory-overload-vulnerability","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-1948-eclipse-jetty-http-2-server-memory-overload-vulnerability\/","title":{"rendered":"CVE-2025-1948: Eclipse Jetty HTTP\/2 Server Memory Overload Vulnerability<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The vulnerability identified as CVE-2025-1948 is a severe flaw in the Eclipse Jetty HTTP\/2 server, affecting versions 12.0.0 to 12.0.16. This vulnerability allows an HTTP\/2 client to commandeer the server’s resources by specifying a large value for a specific HTTP\/2 settings parameter, potentially leading to OutOfMemoryErrors and even causing the JVM process to exit.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-1948
\nSeverity: High (7.5 CVSS score)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system compromise and data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

Eclipse Jetty | 12.0.0 to 12.0.16<\/p>\n

How the Exploit Works<\/strong><\/p>\n

An attacker, using an HTTP\/2 client, can exploit this vulnerability by setting a very large value for the SETTINGS_MAX_HEADER_LIST_SIZE parameter. Since the Jetty server does not validate this setting, it attempts to allocate a ByteBuffer of the specified capacity to encode HTTP responses. This can lead to the server running out of memory and throwing an OutOfMemoryError, or even causing the JVM process to exit, resulting in potential system compromise and data leakage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Below is a conceptual example of how the vulnerability might be exploited:<\/p>\n

POST \/ HTTP\/2.0\nHost: vulnerable-server.com\nContent-Type: application\/json\n:authority: vulnerable-server.com\n:path: \/\n:scheme: https\n:method: POST\nsettings-max-header-list-size: 9999999999\n{ \"request_payload\": \"...\" }<\/code><\/pre>\n
In the above example, the malicious client has specified an extremely large value for the SETTINGS_MAX_HEADER_LIST_SIZE parameter, which could lead to a successful exploit of the vulnerability.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The vulnerability identified as CVE-2025-1948 is a severe flaw in the Eclipse Jetty HTTP\/2 server, affecting versions 12.0.0 to 12.0.16. This vulnerability allows an HTTP\/2 client to commandeer the server’s resources by specifying a large value for a specific HTTP\/2 settings parameter, potentially leading to OutOfMemoryErrors and even causing the JVM process to exit. […]<\/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,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-86323","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t