CVE-2025-1948: jetty DoS — Fix

Description

In Eclipse Jetty versions 12.0.0 to 12.0.16 included, an HTTP/2 client can specify a very large value for the HTTP/2 settings parameter SETTINGS_MAX_HEADER_LIST_SIZE. The Jetty HTTP/2 server does not perform validation on this setting, and tries to allocate a ByteBuffer of the specified capacity to encode HTTP responses, likely resulting in OutOfMemoryError being thrown, or even the JVM process exiting.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
eclipse	jetty	12.0.0 — 12.0.17

References

Advisories & Patches

https://github.com/jetty/jetty.project/security/advisories/GHSA-889j-63jv-qhr8

Other References

https://gitlab.eclipse.org/security/cve-assignement/-/issues/56

Frequently Asked Questions

What is CVE-2025-1948? +

In Eclipse Jetty versions 12.0.0 to 12.0.16 included, an HTTP/2 client can specify a very large value for the HTTP/2 settings parameter SETTINGS_MAX_HEADER_LIST_SIZE. The Jetty HTTP/2 server does not perform validation on this setting, and tries to allocate a ByteBuffer of the specified capacity to encode HTTP responses, likely resulting in OutOfMemoryError being thrown, or even the JVM process exiting. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-1948? +

CVE-2025-1948 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-1948? +

CVE-2025-1948 affects products from eclipse, specifically: jetty. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-1948? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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