⚠ Actively exploited
Added to CISA KEV on 2023-03-14. Federal agencies required to patch by 2023-04-04. Required action: Apply updates per vendor instructions..

CVE-2023-23397

CWE-20 — Improper Input ValidationCWE-29442 documents19 sources
Severity
9.8CRITICAL
EPSS
93.4%
top 0.19%
CISA KEV
KEV
Added 2023-03-14
Due 2023-04-04
Exploit
Exploited in wild
Active exploitation observed
Affected products
8
Microsoft Microsoft 365 Apps FOR EnterpriseMicrosoft Microsoft Office 2019Microsoft Microsoft Office Ltsc 2021+5 more
Timeline
PublishedMar 14
KEV addedMar 14
KEV dueApr 4
Latest updateDec 7
CISA Required Action: Apply updates per vendor instructions.

Description

Microsoft Outlook Elevation of Privilege Vulnerability

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HExploitability: 3.9 | Impact: 5.9

Affected Packages8 packages

▶CVEListV5microsoft/microsoft_outlook_201616.0.0.0 — 16.0.5387.1000
▶CVEListV5microsoft/microsoft_outlook_2013_service_pack_115.0.0.0 — 15.0.5537.1000
▶NVDmicrosoft/outlook2013, 2016+1
▶CVEListV5microsoft/microsoft_office_201919.0.0 — https://aka.ms/OfficeSecurityReleases
▶CVEListV5microsoft/microsoft_office_ltsc_202116.0.1 — https://aka.ms/OfficeSecurityReleases

Patches

Patch: msrc.microsoft.com ↗Patch: msrc.microsoft.com ↗

🔴Vulnerability Details

3
GHSA
GHSA-4778-q233-jmh5: Microsoft Outlook Elevation of Privilege Vulnerability↗2023-03-14
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CVEList
Microsoft Outlook Elevation of Privilege Vulnerability↗2023-03-14
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VulnCheck
Microsoft Office Outlook Privilege Escalation Vulnerability↗2023
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🔍Detection Rules

9
Suricata
ET EXPLOIT Possible Microsoft Outlook Elevation of Privilege Payload Observed M3 (CVE-2023-23397)↗2023-03-16
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Suricata
ET EXPLOIT Possible Microsoft Outlook Elevation of Privilege Payload Observed M4 (CVE-2023-23397)↗2023-03-16
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Suricata
ET EXPLOIT Possible Microsoft Outlook Elevation of Privilege Payload Observed M1 (CVE-2023-23397)↗2023-03-16
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Suricata
ET EXPLOIT Possible Microsoft Outlook Elevation of Privilege Payload Observed M5 (CVE-2023-23397)↗2023-03-16
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Suricata
ET EXPLOIT Possible Microsoft Outlook Elevation of Privilege Payload Observed M8 (CVE-2023-23397)↗2023-03-16
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📋Vendor Advisories

2
Microsoft
Microsoft Outlook Elevation of Privilege Vulnerability↗2023-03-14
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CISA
Microsoft Office Outlook Privilege Escalation Vulnerability↗2023-03-14
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🕵️Threat Intelligence

24
Unit42
Fighting Ursa Aka APT28: Illuminating a Covert Campaign↗2023-12-07
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Bleepingcomputer
Russian military hackers target NATO fast reaction corps↗2023-12-07
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Bleepingcomputer
Russian hackers exploiting Outlook bug to hijack Exchange accounts↗2023-12-04
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Securelist
IT threat evolution Q3 2023↗2023-12-01
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Securelist
Comprehensive analysis of initial attack samples exploiting CVE-2023-23397 vulnerability↗2023-07-19
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