CVE-2019-0752

CVE-2019-0752 is a type confusion (CWE-843) memory corruption vulnerability in the way the scripting engine used by Internet Explorer handles objects in memory, and it is distinct from the related scripting-engine flaws CVE-2019-0739, CVE-2019-0753, and CVE-2019-0862. An attacker triggers it by convincing a user to view attacker-controlled or attacker-crafted web content in Internet Explorer, where malformed handling of in-memory objects corrupts memory (the CVSS vector reflects a network attack requiring user interaction with high attack complexity). Successful exploitation yields remote code execution with the privileges of the current user, giving the attacker high confidentiality, integrity, and availability impact on the host. Anyone running Internet Explorer on supported Windows client or server systems is exposed; the provided data does not specify exact affected version ranges, though the public proof-of-concept was demonstrated on Windows 10 1809 (build 17763.316). Exploitation is confirmed in the wild: the flaw is in CISA's Known Exploited Vulnerabilities catalog (added 2022-02-15) with known ransomware use, carries a top-percentile EPSS score of 81.6%, and contemporary reporting ties scripting-engine flaws like this to exploit kits (e.g., RIG) delivering malware such as Dridex.

What to do: Apply Microsoft's security updates that address CVE-2019-0752 via Windows Update or WSUS, per the CISA KEV required action, and audit legacy Windows clients and servers for any that have not been patched. Where updates are impractical (e.g., out-of-support systems), stop using Internet Explorer as the default browser, restrict or disable scripting in the Internet zone, and consider blocking IE-facing access to untrusted sites. Because exploit kits (e.g., RIG) and ransomware operators have leveraged IE scripting-engine flaws, prioritize patching user workstations and shared/multi-user systems.