CVE-2024-21413 | Microsoft Outlook Remote Code Execution Vulnerability

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Microsoft Outlook Remote Code Execution Vulnerability

Published: 2024-02-13 Last update: 2025-10-28 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-21413 is rated Critical Active Threat (98.8/100): CVSS Critical severity, with high exploitation likelihood (EPSS 92.96%, 100th percentile). CISA KEV confirms active exploitation (added 2025-02-06) affecting Microsoft / Office Outlook. 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-2024-21413

Name: Microsoft Outlook Improper Input Validation Vulnerability · CISA KEV detail

Exploit added: 2025-02-06

Action due: 2025-02-27

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Public exploit references (Exploit-DB) for CVE-2024-21413

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2024-21413

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 2026-03-20 93.26% 92.96% -0.30%
2 2026-03-04 93.12% 93.26% +0.15%
3 2026-03-03 — 93.12% —

Full EPSS history (52 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-21413

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]

Weakness enumeration for CVE-2024-21413

Affected software / configurations for CVE-2024-21413

Vendor Product Version Raw CPE
microsoft 365_apps — cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:*:*
microsoft office_2016 — cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x64:*
microsoft office_2016 — cpe:2.3:a:microsoft:office_2016:-:*:*:*:-:*:x86:*
microsoft office_2019 — cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x64:*
microsoft office_2019 — cpe:2.3:a:microsoft:office_2019:-:*:*:*:*:*:x86:*
microsoft office_long_term_servicing_channel 2021 cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:*:*:*

References for CVE-2024-21413

cvelogic Threat Intelligence