[ CVE-2021-33766 · Published 14 Jul 2021 ]
Microsoft Exchange Server Information Disclosure
Exploited · CISA KEV CVSS 7.3
EPSS 98%Fix available
[ Why it matters ]Priority signals
- Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-01-18
- EPSS: 98% chance of exploitation in the next 30 days (higher than 100% of CVEs)
[ Description ]Official description
Microsoft Exchange Server Information Disclosure Vulnerability
CISA: Microsoft Exchange Server contains an information disclosure vulnerability which can allow an unauthenticated attacker to steal email traffic from target.
[ Fixes ]Fixes and patches
CISA required action (US federal deadline 1 Feb 2022): Apply updates per vendor instructions.
- Patch on msrc.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
- Patch on portal.msrc.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
[ References ]References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2021-33766PatchVendor Advisory
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33766PatchVendor Advisory
- www.zerodayinitiative.com/advisories/ZDI-21-798Third Party AdvisoryVDB Entry
- www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource