critical9.1Known exploitedPublic exploit code
CVE-2021-26855
Microsoft Exchange Server Remote Code Execution Vulnerability
Exploited in the wild
This vulnerability is on a Known Exploited Vulnerabilities catalogue, added 2021-11-03. Federal due date: 2022-05-03.
Apply updates per vendor instructions.
Public exploit code
Working exploit or proof of concept code has been published for this vulnerability. Treat unpatched systems as at risk.
- Microsoft Exchange 2019 - Unauthenticated Email Download (Metasploit)2021-05-21 · webapps · windows
- Microsoft Exchange 2019 - Unauthenticated Email Download2021-05-18 · webapps · windows
- Microsoft Exchange 2019 - Server-Side Request Forgery2021-03-14 · remote · windows
- Microsoft Exchange 2019 - Server-Side Request Forgery (Proxylogon) (PoC)2021-03-11 · webapps · windows
Impact
Microsoft Exchange Server Remote Code Execution Vulnerability
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Microsoft | Exchange Server | Versions 2013, 2016, 2019 |
Weakness classification
References
- NVD record
- CVE.org record
- CISA KEV catalog
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-26855
- http://packetstormsecurity.com/files/161846/Microsoft-Exchange-2019-SSRF-Arbitrary-File-Write.html
- http://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html
- http://packetstormsecurity.com/files/162610/Microsoft-Exchange-2019-Unauthenticated-Email-Download.html
- http://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26855
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26855