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CVE-2021-33766: Microsoft Exchange Server

EPSS98.1%No. 263 of 1739 in KEV
CVE year2021~1 yrs before listing
Same vendor in KEV389
Same product17
FieldValue
VendorMicrosoft
ProductExchange Server
NameMicrosoft Exchange Server Information Disclosure
Added to KEV2022-01-18
US federal due date2022-02-01
Ransomware useUnknown
CWECWE-287

CISA description

Microsoft Exchange Server contains an information disclosure vulnerability which can allow an unauthenticated attacker to steal email traffic from target.

Other entries for this product

CVEVendor / productAddedEPSSRansomware
CVE-2023-21529Microsoft Exchange Server2026-04-1359.2%Known
CVE-2021-31196Microsoft Exchange Server2024-08-2154.0%Unknown
CVE-2024-21410Microsoft Exchange Server2024-02-1512.5%Unknown
CVE-2022-41080Microsoft Exchange Server2023-01-1077.3%Known
CVE-2022-41082Microsoft Exchange Server2022-09-3099.9%Known
CVE-2022-41040Microsoft Exchange Server2022-09-3099.9%Known
CVE-2018-8581Microsoft Exchange Server2022-03-0327.3%Known
CVE-2021-34523Microsoft Exchange Server2021-11-0399.9%Known
CVE-2021-34473Microsoft Exchange Server2021-11-0399.9%Known
CVE-2021-31207Microsoft Exchange Server2021-11-0399.7%Known
CVE-2021-27065Microsoft Exchange Server2021-11-0399.8%Known
CVE-2021-26858Microsoft Exchange Server2021-11-0393.6%Known
CVE-2021-26857Microsoft Exchange Server2021-11-0395.7%Known
CVE-2021-26855Microsoft Exchange Server2021-11-0399.9%Known
CVE-2020-17144Microsoft Exchange Server2021-11-0336.5%Unknown

NVD — CVE-2021-33766

Data from CISA's Known Exploited Vulnerabilities (KEV) catalog. EPSS is FIRST's estimated probability of exploitation activity in the next 30 days, refreshed weekly. Always follow the vendor's official guidance.
About this page

A Microsoft Exchange Server vulnerability added to CISA's Known Exploited Vulnerabilities catalog on 2022-01-18.