The REST Plugin in Apache Struts 2.1.1 through 2.3.x before 2.3.34 and 2.5.x before 2.5.13 uses an XStreamHandler with an instance of XStream for deserialization without any type filtering, which can lead to Remote Code Execution when deserializing XML payloads.
http://www.oracle.com/technetwork/security-advisory/alert-cve-2017-9805-3889403.html
http://www.securityfocus.com/bid/100609
http://www.securitytracker.com/id/1039263
https://blogs.apache.org/foundation/entry/apache-struts-statement-on-equifax
https://bugzilla.redhat.com/show_bug.cgi?id=1488482
https://cwiki.apache.org/confluence/display/WW/S2-052
https://lgtm.com/blog/apache_struts_CVE-2017-9805
https://security.netapp.com/advisory/ntap-20170907-0001/
https://struts.apache.org/docs/s2-052.html
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170907-struts2
Source: MITRE
Published: 2017-09-15
Updated: 2019-08-12
Type: CWE-502
Base Score: 6.8
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 8.1
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 2.2
Severity: HIGH