The overflow protection in Expat is removed by compilers with certain optimization settings, which allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via crafted XML data. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-1283 and CVE-2015-2716.
http://www.ubuntu.com/usn/USN-3013-1
https://bugzilla.redhat.com/show_bug.cgi?id=1344251
https://sourceforge.net/p/expat/code_git/ci/f0bec73b018caa07d3e75ec8dd967f3785d71bde
http://www.securityfocus.com/bid/91528
https://security.gentoo.org/glsa/201701-21
https://www.tenable.com/security/tns-2016-20
https://kc.mcafee.com/corporate/index?page=content&id=SB10365
Source: MITRE
Published: 2016-06-30
Updated: 2021-07-31
Type: CWE-119
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