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CVE-2023-21745: microsoft exchange_server Deserialization of Untrusted Data

CVSS: 8.0v3.1HighModified
Published 10-01-2023Last modified 28-02-2025
Open JSON

Vulnerability summary

CVE-2023-21745 is a high (CVSS 8.0) Deserialization of Untrusted Data vulnerability in microsoft exchange_server. EPSS estimates a 1.50% chance of exploitation in the next 30 days, higher than 73.8% of scored vulnerabilities.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.0/10
010
High · v3.1 (CVE.org)
EPSS score
1.50%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-01-2023
    PublishedVulnerability first disclosed.
  2. 28-02-2025
    Last modifiedVulnerability information updated.

Description

Microsoft Exchange Server Spoofing Vulnerability

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

1.50%

Chance of exploitation in the next 30 days

Percentile

74%

Versus all other CVEs

30-day change

0.00 pp

From 1.50% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.50%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Microsoft4 products

1 vendor · 4 products

References

1 links