Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2021-26858

7.8HIGH

Key Information:

Vendor
Microsoft
Status
Microsoft Exchange Server 2019
Microsoft Exchange Server 2013 Cumulative Update 22
Microsoft Exchange Server 2019 Cumulative Update 2
Microsoft Exchange Server 2016 Cumulative Update 13
Vendor
CVE Published:
3 March 2021

Badges

💰 Ransomware👾 Exploit Exists🟣 EPSS 15%🦅 CISA Reported

Summary

Microsoft Exchange Server Remote Code Execution Vulnerability

CISA Reported

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed as being exploited and is known by the CISA as enabling ransomware campaigns.

The CISA's recommendation is: Apply updates per vendor instructions.

Affected Version(s)

Microsoft Exchange Server 2013 Cumulative Update 21 x64-based Systems 15.00.0

Microsoft Exchange Server 2013 Cumulative Update 22 x64-based Systems 15.00.0

Microsoft Exchange Server 2013 Cumulative Update 23 x64-based Systems 15.00.0

References

https://portal.msrc.microsoft.com/en-US/security-guidance...
x_refsource_MISC

EPSS Score

15% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • 💰

    Used in Ransomware

  • 👾

    Exploit known to exist

  • 🦅

    CISA Reported

  • Vulnerability published

  • Vulnerability Reserved

Collectors

NVD DatabaseMitre DatabaseCISA Database
.