What is CVE-2023-21538?

CVE-2023-21538 is a high-severity vulnerability in Microsoft .Net 6.0, classified under Deserialization of Untrusted Data. CVSS score: 7.5/10. Published 2023-01-10.

How severe is CVE-2023-21538?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2023-21538 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Deserialization in Microsoft .Net 6.0

CVE-2023-21538

.NET Denial of Service Vulnerability

Vulnerability class: Insecure Deserialization

EPSS: 0.011 (78.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C.

Affected products

Microsoft .Net 6.0 — versions 6.0.0
Microsoft Powershell 7.2 — versions 7.2.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

Public proof-of-concept exploits

References

.NET Denial of Service Vulnerability (vendor-advisory)

Frequently asked questions

What is CVE-2023-21538?: CVE-2023-21538 is a high-severity vulnerability in Microsoft .Net 6.0, classified under Deserialization of Untrusted Data. CVSS score: 7.5/10. Published 2023-01-10.
How severe is CVE-2023-21538?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2023-21538 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.