CVE-2021-34523—Microsoft Exchange Server Privilege Escalation Vulnerability

Vulnerability Name

Microsoft Exchange Server Privilege Escalation Vulnerability

Description

Microsoft Exchange Server contains an unspecified vulnerability that allows for privilege escalation.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

KNOWN

Action

Apply updates per vendor instructions.

Additional Notes

• https://nvd.nist.gov/vuln/detail/CVE-2021-34523

Related News Articles

• Hackers Target Over 70 Microsoft Exchange Servers to Steal Credentials via KeyloggersJune 24, 2025
• Leaked Black Basta Ransomware Chat Logs Reveal Inner Workings and Internal ConflictsFebruary 26, 2025
• CISA and FBI: Ghost ransomware breached orgs in 70 countriesFebruary 19, 2025
• CISA says BianLian ransomware now focuses only on data theftNovember 21, 2024
• Chinese-Speaking Hacker Group Targets Human Rights Studies in Middle EastSeptember 5, 2024

Related Weaknesses

• CWE-287