Microsoft Exchange Server Remote Code Execution Vulnerability

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Mar 2, 2021 · Catalog

   Detected

   Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

2. Nov 3, 2021 · CISA KEV

   Known exploited

   Apply updates per vendor instructions.

3. May 3, 2022 · CISA KEV

   Remediation due

   Apply updates per vendor instructions.

4. Oct 1, 2026 · Catalog

   Updated

   Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

Affected

• cpe microsoft/exchange server2013
• cpe microsoft/exchange server2016
• vendor Microsoft Exchange Serverversion unspecified

Sources

• CISA KEVConfirmed exploitationCVE-2021-27065

  Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution. This vulnerability is part of the ProxyLogon exploit chain.

  cisa.gov
• CVE.orgVulnerability recordCVE-2021-27065

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2021-27065

  30-day exploitation probability 99.9%

  first.org
• Exploit DatabasePublic exploit reference49637

  Public archive entry. The exploit body is not stored here.

  exploit-db.com
• Metasploit ModulesPublic exploit moduleexploit_windows/http/exchange_proxylogon_rce

  Public module reference (excellent). Module source is not copied into this catalog.

  rapid7.com
• NIST NVDVulnerability recordCVE-2021-27065

  Microsoft Exchange Server Remote Code Execution Vulnerability

  nvd.nist.gov
• Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/161938/Microsoft-Exchange-ProxyLogon-Remote-Code-Execution.html

  Packet Storm link already published on the finding.

  packetstormsecurity.com
• Packet Storm SecurityCited referencehttp://packetstormsecurity.com/files/162736/Microsoft-Exchange-ProxyLogon-Collector.html

  Packet Storm link already published on the finding.

  packetstormsecurity.com

References

• Exploit · packetstormsecurity.com
• Exploit · packetstormsecurity.com
• Patch · msrc.microsoft.com
• CISA note · nvd.nist.gov
• Patch · portal.msrc.microsoft.com
• US Government Resource · cisa.gov
• CISA note · cisa.gov