Microsoft Security Response Center

Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.

**Is the Preview Pane an attack vector for this vulnerability?** Yes, the Preview Pane is an attack vector.

**According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do?** An attacker must send the user a malicious file and convince them to open it.

**Is the Preview Pane an attack vector for this vulnerability?** No, the Preview Pane is not an attack vector.

**According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability?** Any authenticated attacker could trigger this vulnerability. It does not require admin or other elevated privileges.

**What privileges could be gained by an attacker who successfully exploited this vulnerability?** An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.

**According to the CVSS metric, privileges required is high (PR:H). What privileges are required to exploit this vulnerability?** To successfully exploit the vulnerability, an attacker must be part of a specific user group.

Integer overflow or wraparound in Windows Projected File System allows an authorized attacker to elevate privileges locally.

Out-of-bounds read in Windows Projected File System allows an authorized attacker to elevate privileges locally.

**According to the CVSS metric, a successful exploitation could lead to a scope change (S:C). What does this mean for this vulnerability?** In this case, a successful attack could be performed from a low privilege Hyper-V guest. The attacker could traverse the guest's security boundary to cause denial of service on the Hyper-V host environment.