CVE-2023-23397 | Microsoft Outlook Elevation of Privilege Vulnerability

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Microsoft Outlook Elevation of Privilege Vulnerability

Published: 2023-03-14 Last update: 2025-10-27 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-23397 is rated Critical Active Threat (99/100): CVSS Critical severity, with high exploitation likelihood (EPSS 93.38%, 100th percentile). CISA KEV confirms active exploitation (added 2023-03-14) affecting Microsoft / Office. a weakness (CWE-20) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2023-23397

Name: Microsoft Office Outlook Privilege Escalation Vulnerability · CISA KEV detail

Exploit added: 2023-03-14

Action due: 2023-04-04

Required action: Apply updates per vendor instructions.

Exploit prediction scoring system (EPSS) score for CVE-2023-23397

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-02 93.49% 93.38% -0.11%
2 2026-05-23 93.40% 93.49% +0.09%
3 2026-05-08 — 93.40% —

Full EPSS history (75 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-23397

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]

Weakness enumeration for CVE-2023-23397

Affected software / configurations for CVE-2023-23397

Vendor Product Version Raw CPE
microsoft 365_apps — cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*
microsoft office 2019 cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:*:*
microsoft office_long_term_servicing_channel 2021 cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:*:*
microsoft outlook 2013 cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:-:*:*:*
microsoft outlook 2013 cpe:2.3:a:microsoft:outlook:2013:sp1:*:*:rt:*:*:*
microsoft outlook 2016 cpe:2.3:a:microsoft:outlook:2016:*:*:*:*:*:*:*

References for CVE-2023-23397

cvelogic Threat Intelligence