HIGHCVSS 7.3Actively exploited · CISA KEV since 2022-01-18Vulnerability
CVE-2021-33766
Microsoft Exchange Server contains an information disclosure vulnerability which can allow an unauthenticated attacker to steal email traffic from target.
Properties
- Euvd product
- Microsoft Exchange Server 2019 Cumulative Update 8, Microsoft Exchange Server 2016 Cumulative Update 20, Microsoft Exchange Server 2019 Cumulative Update 9, Microsoft Exchange Server 2016 Cumulative Update 19, Microsoft Exchange Server 2013 Cumulative Update 23
- Vulnerability name
- Microsoft Exchange Server Information Disclosure
- First seen
- 2026-08-10T15:11:36+00:00
- Cvss score
- 7.3
- Epss score
- 0.98176
- Last seen
- 2026-10-19T12:00:27+00:00
- Due date
- 2022-02-01
- Euvd assigner
- microsoft
- Retrieved at
- 2026-10-21T01:24:47+00:00
- Exploited euvd since
- 2022-01-18T00:00:00+00:00
- Src batch id
- epss_history-20261020T103617Z-728ddd
- Source url
- https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
- Date added
- 2022-01-18
- Euvd base score version
- 3.1
- Score
- 7.3
- Fetched at
- 2026-10-20T10:36:20+00:00
- Euvd vendor
- Microsoft
- Cvss vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
- In Signal since
- initial import (Sep 2026)
- Euvd base score
- 7.3
Related Entities (7)
AFFECTS_PRODUCT (5)
DESCRIBES (1)
INVOLVES (1)
Explore deeper with Ninja Signal's threat intelligence graph