title: Jetty accepts "+" prefixed value in Content-Length
description: Jetty is a Java based web server and servlet engine. Prior to versions 9.4.52, 10.0.16, 11.0.16, and 12.0.1, Jetty accepts the `+` character proceeding the content-length value in a HTTP/1 header field.  This is more permissive than allowed by the RFC and other servers routinely reject such requests with 400 responses.  There is no known exploit scenario, but it is conceivable that request smuggling could result if jetty is used in combination with a server that does not close the connection after sending such a 400 response. Versions 9.4.52, 10.0.16, 11.0.16, and 12.0.1 contain a patch for this issue. There is no workaround as there is no known exploit scenario.
problem types: CWE-130: Improper Handling of Length Parameter Inconsistency
affected:
{
vendor: eclipse
product: jetty.project
versions:
version: >= 9.0.0, <= 9.4.51, status: affected
version: >= 10.0.0, <= 10.0.15, status: affected
version: >= 11.0.0, <= 11.0.15, status: affected
version: = 12.0.0, status: affected
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: NONE
baseScore: 5.3
baseSeverity: MEDIUM
confidentialityImpact: NONE
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
version: 3.1
]