MEDIUM
In Undertow before versions 7.1.2.CR1, 7.1.2.GA it was found that the fix for CVE-2016-4993 was incomplete and Undertow web server is vulnerable to the injection of arbitrary HTTP headers, and also response splitting, due to insufficient sanitization and validation of user input before the input is used as part of an HTTP header value.
https://access.redhat.com/errata/RHSA-2018:1247
https://access.redhat.com/errata/RHSA-2018:1248
https://access.redhat.com/errata/RHSA-2018:1249
https://access.redhat.com/errata/RHSA-2018:1251
Source: MITRE
Published: 2018-05-21
Modified: 2018-09-05
Type: CWE-113
Base Score: 5.8
Vector: (AV:N/AC:M/Au:N/C:P/I:P/A:N)
Impact Score: 4.9
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 6.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Impact Score: 2.7
Exploitability Score: 2.8
Severity: MEDIUM