Is CVE-2023-23397 in the CISA KEV catalog?

Yes. CVE-2023-23397 is on the CISA Known Exploited Vulnerabilities list, added 2023-03-14.

What is the CVSS severity of CVE-2023-23397?

CVE-2023-23397 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2023-23397?

CVE-2023-23397 has an EPSS score of 97.41% (100th percentile), estimating the probability of exploitation in the next 30 days.

CVE & CISA-KEV Catalog

CVE-2023-23397

CRITICALCISA KEVEPSS 100th pctl

9.8

CVSS v3

NVD

Description

Microsoft Outlook Elevation of Privilege Vulnerability

CWE-20Improper Input Validation CWE-294

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

97.41%probability of exploitation in 30 days

100thpercentile

Very high risk: more likely to be exploited than 100% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Office Outlook Privilege Escalation Vulnerability

Microsoft Office Outlook contains a privilege escalation vulnerability that allows for a NTLM Relay attack against another service to authenticate as the user.

Apply updates per vendor instructions.

Remediation due: 2023-04-04

References

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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 2025-10-27.