Improper access control in Microsoft Exchange Server - CVE-2019-0686
Published: January 27, 2019 / Updated: February 12, 2019
Vulnerability identifier: #VU17228
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/U:Green
CVE-ID: CVE-2019-0686
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Microsoft
Affected software:
Microsoft Exchange Server
Microsoft Exchange Server
Detailed vulnerability description
The vulnerability allows a remote authenticated user to gain escalated privileges.
The vulnerability exists due to improper access restrictions when processing requests to the "/privexchange" API endpoint. A remote authenticated user with limited privileges and mailbox access can gain DCSync privileges and obtain hashed passwords of all Active Directory users.
How to mitigate CVE-2019-0686
On February 5, 2019 Microsoft has issued a workaround to address this vulnerability.
On February 11 the official patch was released to address this vulnerability.