CVE-2023-23397

CVE Enrichment

CVSS: 9.8 CRITICAL
EPSS: 97.16%
EPSS Percentile: 99.89%
CISA KEV: YES — Known Exploited Vulnerability

Description

Microsoft Outlook Elevation of Privilege Vulnerability

Technical Details

CVSS Version: 3.1
CNA / NVD Source: secure@microsoft.com
Published: 15-Mar-2023 00:15
Last Modified: 17-Jun-2026 12:37
EPSS Date: 2026-10-12
CWE: CWE-20, CWE-294

CVSS Vector


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

CISA KEV Details

Date Added: 2023-03-14
Remediation Due: 2023-04-04
Known Ransomware Campaign Use: Unknown
Required Action: Apply updates per vendor instructions.
Notes: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2023-23397, https://msrc.microsoft.com/blog/2023/03/microsoft-mitigates-outlook-elevation-of-privilege-vulnerability/, ; https://nvd.nist.gov/vuln/detail/CVE-2023-23397

Affected Products / Versions

microsoft / 365_apps
Version / affected range: -
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*
microsoft / office
Version / affected range: 2019
cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*
microsoft / office_long_term_servicing_channel
Version / affected range: 2021
cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:*:*
microsoft / outlook
Version / affected range: 2013
cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:-:*:*:*
microsoft / outlook
Version / affected range: 2013
cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:rt:*:*:*
microsoft / outlook
Version / affected range: 2016
cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:*:*

References

Last enrichment sync: 13-Oct-2026 02:09
Sources: NVD · FIRST EPSS · CISA KEV
Latest successful provider update; providers refresh independently.

Reported Context (1)

The Outlook harvest runs in parallel. APT28 weaponised the zero-click flaw CVE-2023-23397, patched by Microsoft in March 2023 after a CERT-UA report. In-the-wild exploitation ran from April to December 2022 against APT28’s Tradecraft Evolves from X-Agent to LLM-Driven Malware

CVE (1)

Malware (16)

People (1)

Threat Actors (35)

Vendors (1)

Products (18)

Tools (4)

Industries (8)

Countries (9)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.