CRITICALCVSS 9.1Actively exploited · CISA KEV since 2021-11-03Vulnerability
CVE-2021-34473
Microsoft Exchange Server contains an unspecified vulnerability that allows for remote code execution.
Properties
- Euvd product
- Microsoft Exchange Server 2016 Cumulative Update 20, Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 8, Microsoft Exchange Server 2019 Cumulative Update 9, Microsoft Exchange Server 2016 Cumulative Update 19
- Vulnerability name
- Microsoft Exchange Server Remote Code Execution Vulnerability
- First seen
- 2026-08-10T15:11:21+00:00
- Cvss score
- 9.1
- Epss score
- 0.99999
- Last seen
- 2026-10-19T12:00:27+00:00
- Due date
- 2021-11-17
- Euvd assigner
- microsoft
- Retrieved at
- 2026-10-21T01:24:47+00:00
- Exploited euvd since
- 2021-11-03T00:00:00+00:00
- Src batch id
- epss_history-20261020T103617Z-728ddd
- Source url
- https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
- Date added
- 2021-11-03
- Euvd base score version
- 3.1
- Score
- 9.1
- 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:H/I:H/A:N
- In Signal since
- initial import (Sep 2026)
- Euvd base score
- 9.1
Related Entities (11)
AFFECTS_PRODUCT (5)
MENTIONED_IN (3)
DESCRIBES (1)
HAS_WEAKNESS (1)
INVOLVES (1)
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