CVE-2021-31207

high-risk
Published 2021-05-11

Microsoft Exchange Server Security Feature Bypass Vulnerability

Do I need to act?

!
93.8% chance of exploitation in next 30 days
EPSS score — higher than 6% of all CVEs
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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
6
CVSS 6.6/10 Medium
NETWORK / HIGH 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-2021-3120...
Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-819/
Exploit http://packetstormsecurity.com/files/163895/Microsoft-Exchange-ProxyShell-Remote...
Patch https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-3120...
Third Party Advisory https://www.zerodayinitiative.com/advisories/ZDI-21-819/
US Government Resource https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-...
59
/ 100
high-risk
Severity 20/34 · Moderate
Exploitability 27/34 · High
Exposure 12/34 · Low