Is CVE-2023-21709 in the CISA KEV catalog?

No. CVE-2023-21709 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-21709?

CVE-2023-21709 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2023-21709?

CVE-2023-21709 has an EPSS score of 1.86% (77th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-21709?

Install KB5030524 for Microsoft Exchange Server 2016 Cumulative Update 23. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2023-21709

CRITICALEPSS 77th pctl

9.8

CVSS v3

NVD

Description

Microsoft Exchange Server Elevation of Privilege Vulnerability

CWE-307

How to fix

Remediation Available

Microsoft Exchange Server 2016 Cumulative Update 23Microsoft

Install:KB5030524Microsoft

Microsoft Exchange Server 2019 Cumulative Update 12Microsoft

Install:KB5030524Microsoft

Microsoft Exchange Server 2019 Cumulative Update 13Microsoft

Install:KB5030524Microsoft

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

1.86%probability of exploitation in 30 days

77thpercentile

Elevated risk: more likely to be exploited than 77% of all known CVEs.

References

Patch1

msrc.microsoft.com

Embed a live status badge for CVE-2023-21709

Markdown

[![CVE-2023-21709](https://tridentstack.com/cve/badge/CVE-2023-21709.svg)](https://tridentstack.com/cve/CVE-2023-21709)

HTML

<a href="https://tridentstack.com/cve/CVE-2023-21709"><img src="https://tridentstack.com/cve/badge/CVE-2023-21709.svg" alt="CVE-2023-21709"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.