CVE-2023-21707: microsoft exchange_server Deserialization of Untrusted Data
CVSS: 8.8v3.1HighModified
Published 14-02-2023Last modified 19-08-2026
Vulnerability summary
CVE-2023-21707 is a high (CVSS 8.8) Deserialization of Untrusted Data vulnerability in microsoft exchange_server. EPSS estimates a 82.02% chance of exploitation in the next 30 days, higher than 99.6% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (CVE.org)EPSS score
82.02%
0%100%
Critical · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 14-02-2023PublishedVulnerability first disclosed.
- 19-08-2026Last modifiedVulnerability information updated.
Description
Microsoft Exchange Server Remote Code Execution Vulnerability
CVSS metrics
2 scores · 2 sources · 1 versionHigh 8.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
82.02%
Chance of exploitation in the next 30 days
Percentile
100%
Versus all other CVEs
30-day change
0.00 pp
From 82.02% on 20-09-2026
20-09-202620-10-2026
EPSS score82.02%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Microsoft5 products
- exchange_server2013:cumulative_update_23 | 2016:cumulative_update_23 | 2019:cumulative_update_11 | 2019:cumulative_update_12
- microsoft exchange server 2013 cumulative update 23≥ 15.00.0, < 15.00.1497.048
- microsoft exchange server 2016 cumulative update 23≥ 15.01.0, < 15.01.2507.023
- microsoft exchange server 2019 cumulative update 11≥ 15.02.0, < 15.02.0986.042
- microsoft exchange server 2019 cumulative update 12≥ 15.02.0, < 15.02.1118.026
1 vendor · 5 products
