CVE-2019-9963: 
XnView MP vulnerability analysis and mitigation

XnView MP 0.93.1 on Windows contains a vulnerability that allows remote attackers to cause a denial of service (application crash) or potentially have unspecified other impact via a crafted file. The vulnerability, identified as CVE-2019-9963, is related to ntdll!RtlFreeHeap functionality and was discovered in March 2019 (NVD, Code610 Blog).

The vulnerability is classified as an Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119). It received a CVSS v3.0 Base Score of 7.8 (HIGH) with the vector string CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. The issue specifically relates to memory handling in the ntdll!RtlFreeHeap component when processing crafted files (NVD).

The vulnerability can lead to denial of service conditions through application crashes. Additionally, there may be potential for unspecified other impacts due to the memory corruption nature of the vulnerability. The high CVSS score indicates potential for significant impact on confidentiality, integrity, and availability of the affected system (NVD).

The vulnerability requires local access and user interaction to exploit, as indicated by the CVSS vector. A proof of concept exploit has been publicly documented that demonstrates the crash condition through a crafted file (Code610 Blog).