CVE-2021-31207: Microsoft Exchange Server Security Feature Bypass Vulnerability
Medium · CVSS 6.6 (CVSS 3.1)KEV known exploitedEPSS 99.8%, 100th percentilePublished Updated Assigner: microsoft
In CISA’s Known Exploited Vulnerabilities catalog: Microsoft Exchange Server Security Feature Bypass Vulnerability.
Added , federal remediation due . Known ransomware use: Known.
Required action: Apply updates per vendor instructions.
Description
Microsoft Exchange Server Security Feature Bypass Vulnerability
Vector CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
Microsoft: Microsoft Exchange Server 2013 Cumulative Update 23Microsoft: Microsoft Exchange Server 2016 Cumulative Update 19Microsoft: Microsoft Exchange Server 2016 Cumulative Update 20Microsoft: Microsoft Exchange Server 2019 Cumulative Update 8Microsoft: Microsoft Exchange Server 2019 Cumulative Update 9
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote-Code-Execution.html (opens in new tab)
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-31207 (opens in new tab)
- www.zerodayinitiative.com/advisories/ZDI-21-819/ (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)