# CVE-2021-42321: A Microsoft Exchange bug is being used in attacks

Status: Being used now (CISA KEV, added 2021-11-17)
Who: 
Do this: 

## Agent prompt (read-only)
Read-only check, change nothing, send nothing anywhere.
Is Microsoft Exchange (CVE-2021-42321) installed or running on this machine or in this project?
1. Find every copy and its version (apps, packages, containers, lockfiles).
2. Compare each version against the vendor's fixed version for CVE-2021-42321. Quote the vendor page you used.
3. Report a table: where, version, fixed version, status (exposed / fixed / not installed / unsure).
4. List the exact update steps, but do not run them.

## Official description
An authenticated attacker could leverage improper validation in cmdlet arguments within Microsoft Exchange and perform remote code execution.

## Sources
- https://nvd.nist.gov/vuln/detail/CVE-2021-42321
- https://nvd.nist.gov/vuln/detail/CVE-2021-42321

Generated by isitexploited.org from public sources. Verify version numbers against the vendor before acting.