CVE-2021-33766
Microsoft Exchange Server Information Disclosure
Severity Score
7.3
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
2
*Multiple Sources
Exploited in Wild
Yes
*KEV
Decision
-
*SSVC
Descriptions
Microsoft Exchange Server Information Disclosure Vulnerability
Una vulnerabilidad de Divulgación de Información de Microsoft Exchange
This vulnerability allows remote attackers to disclose sensitive information on affected installations of Microsoft Exchange Server. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the authentication of requests to web services within the ecp web application. By issuing a crafted request, an attacker can bypass authentication. An attacker can leverage this vulnerability to disclose information from the server.
Microsoft Exchange Server contains an information disclosure vulnerability which can allow an unauthenticated attacker to steal email traffic from target.
*Credits:
LE XUAN TUYEN - VNPT ISC
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2021-05-28 CVE Reserved
- 2021-07-14 CVE Published
- 2021-09-15 First Exploit
- 2022-01-18 Exploited in Wild
- 2022-02-01 KEV Due Date
- 2024-08-03 CVE Updated
- 2024-10-15 EPSS Updated
CWE
- CWE-287: Improper Authentication
CAPEC
References (4)
| URL | Tag | Source |
|---|---|---|
| https://www.zerodayinitiative.com/advisories/ZDI-21-798 | Third Party Advisory |
|
| URL | Date | SRC |
|---|---|---|
| https://github.com/bhdresh/CVE-2021-33766 | 2021-10-14 | |
| https://github.com/demossl/CVE-2021-33766-ProxyToken | 2021-09-15 |
| URL | Date | SRC |
|---|---|---|
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766 | 2024-07-24 |
| 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" | 2013 Search vendor "Microsoft" for product "Exchange Server" and version "2013" | cumulative_update_23 |
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" | 2016 Search vendor "Microsoft" for product "Exchange Server" and version "2016" | cumulative_update_20 |
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
| ||||||
| 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_9 |
Affected
| ||||||