HIGHCVSS 8.8Actively exploited · CISA KEV since 2026-04-13Vulnerability
CVE-2023-21529
Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.
Properties
- Euvd product
- Microsoft Exchange Server 2013 Cumulative Update 23, Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 11, Microsoft Exchange Server 2019 Cumulative Update 12
- Vulnerability name
- Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability
- First seen
- 2026-08-19T16:26:33+00:00
- Cvss score
- 8.8
- Epss score
- 0.59294
- Last seen
- 2026-10-19T12:00:27+00:00
- Due date
- 2026-04-27
- Euvd assigner
- microsoft
- Retrieved at
- 2026-10-21T01:24:47+00:00
- Exploited euvd since
- 2026-04-13T00:00:00+00:00
- Src batch id
- epss_history-20261020T103617Z-728ddd
- Source url
- https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
- Date added
- 2026-04-13
- Euvd base score version
- 3.1
- Score
- 8.8
- Fetched at
- 2026-10-20T10:36:20+00:00
- Euvd vendor
- Microsoft
- Cvss vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- In Signal since
- initial import (Sep 2026)
- Euvd base score
- 8.8
Related Entities (9)
AFFECTS_PRODUCT (4)
MENTIONED_IN (2)
DESCRIBES (1)
HAS_WEAKNESS (1)
INVOLVES (1)
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