CVE-2021-31209

MEDIUM

Microsoft Exchange Server - Authentication Bypass by Spoofing

Title source: llm
STIX 2.1

Description

Microsoft Exchange Server Spoofing Vulnerability

References (2)

Core 2
Core References
Third Party Advisory, VDB Entry x_refsource_misc
https://www.zerodayinitiative.com/advisories/ZDI-21-615/

Scores

CVSS v3 6.5
EPSS 0.0263
EPSS Percentile 83.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-290
Status published
Products (3)
microsoft/exchange_server 2013 cumulative_update_23
microsoft/exchange_server 2016 cumulative_update_19 (2 CPE variants)
microsoft/exchange_server 2019 cumulative_update_8 (2 CPE variants)
Published May 11, 2021
Tracked Since Feb 18, 2026