CVE-2021-31207
Microsoft Exchange Server Security Feature Bypass 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- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean?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
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Actively exploited
- Fix
- Fixed in 15.00.1497.018, 15.02.0858.012, 15.01.2242.010, 15.01.2176.014, 15.02.0792.015
- 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 is affected by this vulnerability, which allows an attacker to bypass a security feature. Successful exploitation could let an attacker circumvent protections intended to safeguard the server and its data.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
Microsoft Exchange Server Security Feature Bypass 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 2013 Cumulative Update 23
From 15.00.0 · fixed in 15.00.1497.018
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 9
From 15.02.0 · fixed in 15.02.0858.012
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 20
From 15.01.0 · fixed in 15.01.2242.010
- Microsoft Microsoft Exchange Server 2016 Cumulative Update 19
From 15.01.0 · fixed in 15.01.2176.014
- Microsoft Microsoft Exchange Server 2019 Cumulative Update 8
From 15.02.0 · fixed in 15.02.0792.015