XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability which may allow a remote attacker to request data from internal resources that are not publicly available only by manipulating the processed input stream. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.
http://x-stream.github.io/changes.html#1.4.16
https://x-stream.github.io/CVE-2021-21349.html
https://x-stream.github.io/security.html#workaround
https://github.com/x-stream/xstream/security/advisories/GHSA-f6hm-88x3-mfjv
https://lists.debian.org/debian-lts-announce/2021/04/msg00002.html
https://lists.apache.org/thread.html/[email protected]%3Cdev.jmeter.apache.org%3E
https://lists.apache.org/thread.html/[email protected]%3Cusers.activemq.apache.org%3E
https://security.netapp.com/advisory/ntap-20210430-0002/
https://www.oracle.com//security-alerts/cpujul2021.html
https://www.oracle.com/security-alerts/cpuoct2021.html
Source: MITRE
Published: 2021-03-23
Updated: 2022-02-16
Type: CWE-918
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:P/I:N/A:N
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 8.6
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Impact Score: 4
Exploitability Score: 3.9
Severity: HIGH