CVE-2021-24085

Microsoft Exchange Server Spoofing Vulnerability

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Microsoft Exchange Server Spoofing Vulnerability

Una Vulnerabilidad de Suplantación de Identidad de Microsoft Exchange Server. Este ID de CVE es diferente de CVE-2021-1730

Microsoft Exchange Server has a flaw that exists within the HasValidCanary function inside of the Canary15 class. The issue results in an insecure generation of cross site request forgery tokens that can be used to install an office-addins. An attacker can leverage this vulnerability to escalate privileges to an administrative account.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Attack Vector

Network

Attack Complexity

Medium

Authentication

Single

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-01-13 CVE Reserved
2021-02-15 First Exploit
2021-02-24 CVE Published
2023-12-30 EPSS Updated
2024-08-03 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CAPEC

References (2)

URL	Tag	Source

URL	Date	SRC
https://github.com/sourceincite/CVE-2021-24085	2021-02-15

URL	Date	SRC
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24085	2023-12-29

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Microsoft Search vendor "Microsoft"		Exchange Server Search vendor "Microsoft" for product "Exchange Server"				2016 Search vendor "Microsoft" for product "Exchange Server" and version "2016"		cumulative_update_18		Affected
Microsoft Search vendor "Microsoft"		Exchange Server Search vendor "Microsoft" for product "Exchange Server"				2016 Search vendor "Microsoft" for product "Exchange Server" and version "2016"		cumulative_update_19		Affected
Microsoft Search vendor "Microsoft"		Exchange Server Search vendor "Microsoft" for product "Exchange Server"				2019 Search vendor "Microsoft" for product "Exchange Server" and version "2019"		cumulative_update_7		Affected
Microsoft Search vendor "Microsoft"		Exchange Server Search vendor "Microsoft" for product "Exchange Server"				2019 Search vendor "Microsoft" for product "Exchange Server" and version "2019"		cumulative_update_8		Affected