CRITICALCVSS v3.1 9.8Actively exploited · CISA KEV since 2023-03-14Vulnerability

CVE-2023-23397

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

Properties

Vulnerability name
Microsoft Office Outlook Privilege Escalation Vulnerability
Epss score
0.97159
Last seen
2026-10-19T12:00:27+00:00
Year
2023
Due date
2023-04-04
Exploited euvd since
2023-03-14T00:00:00+00:00
Source url
https://epss.empiricalsecurity.com/epss_scores-2026-10-19.csv.gz
Date added
2023-03-14
Score
9.8
Euvd base score version
3.1
Euvd vendor
Microsoft
In Signal since
initial import (Sep 2026)
Euvd base score
9.8
Vendor project
Microsoft
Content hash
b2a670bf057006c926e7a37bf4e49a841c85a47151bb09fe8e13236decee5aef
Published at
2023-03-14T17:15:13.263
Euvd updated
2025-10-21T23:15:23+00:00
Last modified
2026-06-17T05:37:01.380
Euvd epss pct
97.16
Epss percentile
0.99896

Related Entities (10)

AFFECTS_PRODUCT (6)

→[Product]cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:*:*
→[Product]cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:-:*:*:*
→[Product]cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*
→[Product]cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:rt:*:*:*
→[Product]cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:*:*

HAS_WEAKNESS (2)

→[Weakness]Improper Input Validation
→[Weakness]Authentication Bypass by Capture-replay

DESCRIBES (1)

←[KEVEntry]Microsoft Office Outlook Privilege Escalation Vulnerability

INVOLVES (1)

←[Signal]kev_added · 2023-03-14

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CVE-2023-23397 (CVSS v3.1 9.8) — Ninja Signal Threat Intelligence | Ninja Signal