CVE-2021-33766
Microsoft Exchange Server Information Disclosure - [Actively Exploited]
Description
Microsoft Exchange Server Information Disclosure Vulnerability
INFO
Published Date :
July 14, 2021, 6:15 p.m.
Last Modified :
July 24, 2024, 4:45 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
CISA KEV (Known Exploited Vulnerabilities)
For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.
Microsoft Exchange Server contains an information disclosure vulnerability which can allow an unauthenticated attacker to steal email traffic from target.
Apply updates per vendor instructions.
Public PoC/Exploit Available at Github
CVE-2021-33766 has a 13 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-33766.
| URL | Resource |
|---|---|
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766 | Patch Vendor Advisory |
| https://www.zerodayinitiative.com/advisories/ZDI-21-798/ | Third Party Advisory VDB Entry |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
A curated list of my GitHub Stars
None
Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.
cisa-kev vulnerability 0day cisa exploits
None
Python Go C
various pocs for all kinds of exploits
Python
Proxylogon & Proxyshell & Proxyoracle & Proxytoken & All exchange server history vulns summarization :)
attackchains exploit vulnerability exchange-server golang python-script proxylogon proxyshell proxyoracle proxytoken proxyrelay cve-2021-42321 proxymaybeshell proxynotshell
Go Python C C# Batchfile Ruby ASP.NET HTML PowerShell JavaScript
主流供应商的一些攻击性漏洞汇总
CVE-2021-33766-poc
Python
A collection of functions to check Microsoft Exchange Servers for ProxyLogon and ProxyShell
Python
ProxyToken (CVE-2021-33766) : An Authentication Bypass in Microsoft Exchange Server POC exploit
cve-2021-33766 proxytoken exchange-server exploit poc exchange microsoft vulnerability
Shell
Automatic monitor github cve using Github Actions
Python
Research and Publications
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-33766 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-33766 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Modified Analysis by [email protected]
Jul. 24, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Dec. 28, 2023
Action Type Old Value New Value Changed Description Microsoft Exchange Information Disclosure Vulnerability Microsoft Exchange Server Information Disclosure Vulnerability Added CVSS V3.1 Microsoft Corporation AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L -
Initial Analysis by [email protected]
Jul. 16, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Changed Reference Type https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766 No Types Assigned https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766 Patch, Vendor Advisory Changed Reference Type https://www.zerodayinitiative.com/advisories/ZDI-21-798/ No Types Assigned https://www.zerodayinitiative.com/advisories/ZDI-21-798/ Third Party Advisory, VDB Entry Added CWE NIST CWE-287 Added CPE Configuration OR *cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:* *cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_19:*:*:*:*:*:* *cpe:2.3:a:microsoft:exchange_server:2016:cumulative_update_20:*:*:*:*:*:* *cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_8:*:*:*:*:*:* *cpe:2.3:a:microsoft:exchange_server:2019:cumulative_update_9:*:*:*:*:*:* -
CVE Modified by [email protected]
Jul. 15, 2021
Action Type Old Value New Value Added Reference https://www.zerodayinitiative.com/advisories/ZDI-21-798/ [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-33766 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-33766
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
34.75 }} -4.05%
score
0.97059
percentile