CVE-2021-34473

critical-risk
Published 2021-07-14

Microsoft Exchange Server Remote Code Execution Vulnerability

Do I need to act?

!
94.2% chance of exploitation in next 30 days
EPSS score — higher than 6% of all CVEs
!
CISA KEV: actively exploited in the wild
On the Known Exploited Vulnerabilities catalog — federal agencies must patch
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.1/10 Critical
NETWORK / LOW complexity

Affected Products (5)

Affected Vendors

Microsoft

References (7)

Exploit http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote...
Patch https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-3447...
Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-821/
Exploit http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote...
Patch https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-3447...
Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-821/
US Government Resource https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-...
70
/ 100
critical-risk
Severity 31/34 · Critical
Exploitability 27/34 · High
Exposure 12/34 · Low