Published: 11/05/2021 Updated: 02/08/2023

CVSS v2 Base Score: 5.8 | Impact Score: 4.9 | Exploitability Score: 8.6

CVSS v3 Base Score: 6.5 | Impact Score: 4.2 | Exploitability Score: 2.2

VMScore: 516

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:N

This vulnerability allows network-adjacent malicious users to tamper with update data on affected installations of Microsoft Exchange Server. User interaction is required to exploit this vulnerability. The specific flaw exists within the handling of Exchange Server Help updates. The issue results from a missing integrity check on update downloads. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of SYSTEM.

Vulnerable Product	Search on Vulmon	Subscribe to Product
microsoft exchange server 2013
microsoft exchange server 2019
microsoft exchange server 2016

NVD-CWE-noinfo https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31209 https://www.zerodayinitiative.com/advisories/ZDI-21-615/https://nvd.nist.gov https://www.zerodayinitiative.com/advisories/ZDI-21-615/

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CVE-2021-31209

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