CVE-2021-42321
Microsoft Exchange Server Remote Code Execution Vulnerability
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- Fix
- Fixed in 15.01.2308.020, 15.01.2375.017, 15.02.0792.019, 15.02.0986.014
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Microsoft Exchange Server, the email and collaboration server software, is affected by this vulnerability. If exploited, it could allow an attacker to run arbitrary code on the affected server remotely.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
Microsoft Exchange Server Remote Code Execution Vulnerability
Timeline
- CVE published
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
- EPSS reached 10%
FIRST estimates at least a 10% chance of exploitation in the next 30 days
Affected versions
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 21
From 15.01.0 · fixed in 15.01.2308.020
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 22
From 15.0.0 · fixed in 15.01.2375.017
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 10
From 15.02.0 · fixed in 15.02.0792.019
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 11
From 15.02.0 · fixed in 15.02.0986.014