NOOB2ROOT

CVE watch CVE-2021-26855 Known exploited

ProxyLogon: pre-auth SSRF in Exchange

An SSRF in Microsoft Exchange chained to arbitrary file write for unauthenticated RCE. Mass-exploited against on-prem Exchange worldwide.

Severity
9.8
critical
Vendor
Microsoft
Disclosed
2 Mar 2021
Affected
Exchange Server 2013/2016/2019

CVSS breakdown

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Analysis

Placeholder analysis — replace before publishing.

References