CVE-2021-42321 · netVigilance record NV21-0291
Microsoft Exchange Server Remote Code Execution
past due ransomware
What to do
Apply updates per vendor instructions.
CISA deadline 2021-12-01 · passed 4 years 9 months ago · applies to US federal civilian agencies; used elsewhere as a reference SLA
What happened
An authenticated attacker could leverage improper validation in cmdlet arguments within Microsoft Exchange and perform remote code execution.
Who is affected
Microsoft Exchange. Affected version ranges are listed in the vendor advisory and the NVD entry linked under Sources.
Weakness class: CWE-184, CWE-502.
Timeline
- Added to CISA KEVExploitation in the wild confirmed by CISA
- CISA remediation deadlinepassed 4 years 9 months ago
Sources
- NVD entry for CVE-2021-42321 nvd.nist.gov/vuln/detail/CVE-2021-42321
- CISA Known Exploited Vulnerabilities catalog www.cisa.gov/known-exploited-vulnerabilities-catalog
- nvd.nist.gov nvd.nist.gov/vuln/detail/CVE-2021-42321