Microsoft Security Response Center

**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 metrics, successful exploitation of this vulnerability could lead to a high loss of confidentiality (C:H), no effect on integrity (I:N) and some loss of availability (A:L). What does that mean for this vulnerability?** An attacker who successfully exploited this use after free vulnerability could view sensitive, previously freed memory heap information (Confidentiality) since the impacted component might be divulged to the attacker. While the attacker cannot make changes to disclosed information (Integrity), they might be able to force a crash within the function (Availability).

**What privileges could be gained by an attacker who successfully exploited this vulnerability?** An attacker who successfully exploited this vulnerability could elevate from a low integrity level up to a medium integrity level.

**According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?** Successful exploitation of this vulnerability requires an attacker to win a race condition.

Improper access control in Customer Experience Improvement Program (CEIP) allows an authorized attacker to elevate privileges locally.

External control of file name or path in Windows WLAN Service allows an authorized attacker to elevate privileges locally.

Untrusted pointer dereference in Storvsp.sys Driver allows an authorized attacker to deny service locally.

Use after free in Multimedia Class Scheduler Service (MMCSS) allows an authorized attacker to elevate privileges locally.

**How could an attacker exploit this vulnerability?** When multiple attack vectors can be used, we assign a score based on the scenario with the higher risk. In one such scenario for this vulnerability, the attacker could convince a victim to connect to an attacker controlled malicious application (for example, SMB) server. Upon connecting, the malicious server could compromise the protocol.

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