CVE-2024-21378
published 2024-02-13CVE-2024-21378: Microsoft Outlook Remote Code Execution Vulnerability
PriorityP265high8.8CVSS 3.1
AVNACLPRLUINSUCHIHAH
EPSS
11.06%
95.5th percentile
Microsoft Outlook Remote Code Execution Vulnerability
Affected
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | microsoft_365_apps_for_enterprise | >= 16.0.1 < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| microsoft | microsoft_office_2019 | >= 19.0.0 < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| microsoft | microsoft_office_ltsc_2021 | >= 16.0.1 < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| microsoft | microsoft_outlook_2016 | >= 16.0.0.0 < 16.0.5435.1000 | 16.0.5435.1000 |
| microsoft | office | — | — |
| microsoft | office_long_term_servicing_channel | — | — |
| microsoft | outlook | — | — |
| msrc | microsoft_365_apps_for_enterprise_for_32-bit_systems | — | — |
| msrc | microsoft_365_apps_for_enterprise_for_64-bit_systems | — | — |
| msrc | microsoft_office_2019_for_32-bit_editions | — | — |
| msrc | microsoft_office_2019_for_64-bit_editions | — | — |
| msrc | microsoft_office_ltsc_2021_for_32-bit_editions | — | — |
| msrc | microsoft_office_ltsc_2021_for_64-bit_editions | — | — |
| msrc | microsoft_outlook_2016 | — | — |
Detection & IOCsextracted from sources · hover to see the quote
- →The Preview Pane is an attack vector — malicious emails can trigger RCE without the user opening the message, so monitor Outlook previewPane rendering activity for anomalous child-process spawning. ↗
- →Exploitation requires valid Exchange user credentials (PR:L), so monitor for authenticated Exchange users sending specially crafted items followed by unusual process execution from Outlook. ↗
- →Successful exploitation grants high confidentiality, integrity, and availability impact including read, write, and delete capabilities — alert on Outlook spawning child processes with file write or deletion activity. ↗
- ·Microsoft rates this as 'Exploitation More Likely' in the latest software release, indicating a higher probability of weaponized exploit development despite no confirmed in-the-wild exploitation at time of publication. ↗
- ·Remediation is delivered via Click-to-Run update mechanism; patch status should be verified against the referenced KB article and download packages. ↗
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_msrc8.8HIGH
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Microsoft
Microsoft Outlook Remote Code Execution Vulnerability
vendor_msrc·2024-02-13·CVSS 8.8
CVE-2024-21378 [HIGH] CWE-94 Microsoft Outlook Remote Code Execution Vulnerability
Microsoft Outlook Remote Code Execution Vulnerability
FAQ: Is the Preview Pane an attack vector for this vulnerability?
Yes, the Preview Pane is an attack vector.
FAQ: According to the CVSS metrics, successful exploitation of this vulnerability could lead to major loss of confidentiality (C:H), integrity (I:H), and availability (A:H). What does that mean for this vulnerability?
An attacker who successfully exploited this vulnerability could gain high privileges, which include read, write, and delete functionality.
FAQ: According to the CVSS metric, privileges required is low (PR:L). What does that mean for this vulnerability?
The attacker must be authenticated using valid Exchange user credentials.
Microsoft Office Outlook: Microsoft Office Outlook
Microsoft: Microsoft
Customer Actio
GHSA
GHSA-qm4q-xhjm-67jr: Microsoft Outlook Remote Code Execution Vulnerability
ghsa_unreviewed·2024-02-13
CVE-2024-21378 [HIGH] CWE-94 GHSA-qm4q-xhjm-67jr: Microsoft Outlook Remote Code Execution Vulnerability
Microsoft Outlook Remote Code Execution Vulnerability
No detection rules found.
No public exploits indexed.
Greynoiseio
GreyNoise Detects Active Exploitation of CVEs Mentioned in Black Basta’s Leaked Chat Logs
blogs_greynoiseio·2025-02-26·CVSS 9.8
[CRITICAL] GreyNoise Detects Active Exploitation of CVEs Mentioned in Black Basta’s Leaked Chat Logs
CVE Disclosure Early Warning Get an early warning when traffic spikes indicate a high likelihood of new disclosures
Compromised Asset Detection Find out immediately if an asset communicates with a malicious IP address
Vulnerability Prioritization Get real-time insight into active exploitation trends to better understand risk and severity
SOC Efficiency Filter out noisy, low priority and false-positive alerts from mass internet scanners
Incident Investigation Add context to incidents to speed the determinations of scope and timelines
Threat Hunting Quickly identify anomalous behavior and enrich your threat hunting campaigns
Why GreyNoise
CVE Disclosure Early Warning Get an early warning when traffic spikes indicate a high likelihood of new disclosures
Compromised Asset Detection Fin
Qualys
Defense Lessons From the Black Basta Ransomware Playbook
blogs_qualys·2025-02-25
Defense Lessons From the Black Basta Ransomware Playbook
## Table of Contents
Know Your Enemys Playbook
Attackers Move Fast
How Qualys Can Help
The cybersecurity world was rocked last week by a massive leak of Black Basta’s internal communications that emerged from the group’s chat logs. Triggered by internal conflicts and a retaliatory data dump following attacks on Russian banks, the exposed records offer a rare glimpse into Black Basta’s tactics, operations, and leadership.
We’ve analyzed these newly unveiled tactics, and in this blog, we equip security teams with clear, actionable insights. We aim to highlight the key lessons learned—like immediate patching, tighter access controls, and rapid incident response—and provide an urgent call to action. This practical guide aims to help organizations strengthen their defenses against evolving
Qualys
Defense Lessons From the Black Basta Ransomware Playbook | Qualys
blogs_qualys·2025-02-25
Defense Lessons From the Black Basta Ransomware Playbook | Qualys
#### Table of Contents
- Know Your Enemys Playbook
- Attackers Move Fast
- How Qualys Can Help
The cybersecurity world was rocked last week by a massive leak of Black Basta’s internal communications that emerged from the group’s chat logs. Triggered by internal conflicts and a retaliatory data dump following attacks on Russian banks, the exposed records offer a rare glimpse into Black Basta’s tactics, operations, and leadership.
We’ve analyzed these newly unveiled tactics, and in this blog, we equip security teams with clear, actionable insights. We aim to highlight the key lessons learned—like immediate patching, tighter access controls, and rapid incident response—and provide an urgent call to action. This practical guide aims to help organizations strengthen their defenses against ev
Tenable
Microsoft’s February 2024 Patch Tuesday Addresses 73 CVEs (CVE-2024-21351, CVE-2024-21412)
blogs_tenable·2024-02-13·CVSS 7.6
[HIGH] Microsoft’s February 2024 Patch Tuesday Addresses 73 CVEs (CVE-2024-21351, CVE-2024-21412)
## Cloud Exposure
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## Vulnerability Exposure
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## AI Exposure
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## OT/IoT Exposure
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## Identity Exposure
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## Business needs
Active Directory
AI Security Posture Management (AI-SPM)
AWS security
Azure security
Cloud Security Posture Man
Bleepingcomputer
Microsoft February 2024 Patch Tuesday fixes 2 zero-days, 73 flaws
blogs_bleepingcomputer·2024-02-13·CVSS 7.6
[HIGH] Microsoft February 2024 Patch Tuesday fixes 2 zero-days, 73 flaws
## Microsoft February 2024 Patch Tuesday fixes 2 zero-days, 73 flaws
## Lawrence Abrams
16 Elevation of Privilege Vulnerabilities
3 Security Feature Bypass Vulnerabilities
30 Remote Code Execution Vulnerabilities
5 Information Disclosure Vulnerabilities
9 Denial of Service Vulnerabilities
10 Spoofing Vulnerabilities
The total count of 73 flaws does not include 6 Microsoft Edge flaws fixed on February 8th and 1 Mariner flaw.
To learn more about the non-security updates released today, you can review our dedicated articles on the new Windows 11 KB5034765 cumulative update and the Windows 10 KB5034763 update .
## Two zero-days fixed
This month's Patch Tuesday fixes two actively exploited zero-day vulnerabilities, which Microsoft classifies as a flaw that is publicly disclosed or ac
Qualys
Microsoft and Adobe Patch Tuesday, February 2024 Security Update Review | Qualys
blogs_qualys·2024-02-13
Microsoft and Adobe Patch Tuesday, February 2024 Security Update Review | Qualys
#### Table of Contents
- Microsoft Patch Tuesday for February 2024
- Adobe Patches for February 2024
- Zero-day Vulnerabilities Patched in February Patch Tuesday Edition
- Other Critical Severity Vulnerabilities Patched in February Patch Tuesday Edition
- Other Microsoft Vulnerability Highlights
- Microsoft Release Summary
- Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
- Rapid Response with Patch Management (PM)
- EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
- Qualys Monthly Webinar Series
The new Microsoft Patch Tuesday Edition for February 2024 is now live! We invite you to join us to review and discuss the details of these security updates and patches.
## Microsoft Patch Tuesday for February 2024
Microsoft Patch
Qualys
Microsoft and Adobe Patch Tuesday, February 2024 Security Update Review
blogs_qualys·2024-02-13
Microsoft and Adobe Patch Tuesday, February 2024 Security Update Review
## Table of Contents
Microsoft Patch Tuesday for February 2024
Adobe Patches for February 2024
Zero-day Vulnerabilities Patched in February Patch Tuesday Edition
Other Critical Severity Vulnerabilities Patched in February Patch Tuesday Edition
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
Rapid Response with Patch Management (PM)
EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
Qualys Monthly Webinar Series
The new Microsoft Patch Tuesday Edition for February 2024 is now live! We invite you to join us to review and discuss the details of these security updates and patches.
## Microsoft Patch Tuesday for February 2024
Microsoft Patch Tuesday’s Fe
Talos
First Microsoft Patch Tuesday zero-day of 2024 disclosed as part of group of 75 vulnerabilities
blogs_talos·2024-02-13·CVSS 6.5
[MEDIUM] First Microsoft Patch Tuesday zero-day of 2024 disclosed as part of group of 75 vulnerabilities
Microsoft followed up one of the lightest recent Patch Tuesdays in January with a large release of vulnerabilities on Tuesday, although still far from numbers seen in the past.
In all, February’s security update from Microsoft includes 75 vulnerabilities, three of which are considered critical. There are 69 “important” vulnerabilities, according to Microsoft, and three that are of “moderate” severity.
Although considered of moderate risk, one of the vulnerabilities is being actively exploited in the wild — CVE-2024-21351, a security feature bypass vulnerability in Windows SmartScreen. “Smart screen” protects users from malicious websites and files downloaded from the internet. Exploiting this vulnerability may allow a user to be tricked into downloading and executing a file from the inte
Talos
First Microsoft Patch Tuesday zero-day of 2024 disclosed as part of group of 75 vulnerabilities
blogs_talos·2024-02-13·CVSS 6.5
[MEDIUM] First Microsoft Patch Tuesday zero-day of 2024 disclosed as part of group of 75 vulnerabilities
## First Microsoft Patch Tuesday zero-day of 2024 disclosed as part of group of 75 vulnerabilities
Microsoft followed up one of the lightest recent Patch Tuesdays in January with a large release of vulnerabilities on Tuesday, although still far from numbers seen in the past.
In all, February’s security update from Microsoft includes 75 vulnerabilities, three of which are considered critical. There are 69 “important” vulnerabilities, according to Microsoft, and three that are of “moderate” severity.
Although considered of moderate risk, one of the vulnerabilities is being actively exploited in the wild — CVE-2024-21351 , a security feature bypass vulnerability in Windows SmartScreen. “Smart screen” protects users from malicious websites and files downloaded from the internet. Exploiting
Trendmicro
The February 2024 Security Update Review
blogs_trendmicro·2024-02-12·CVSS 7.5
[HIGH] The February 2024 Security Update Review
## The February 2024 Security Update Review
Get the Feburary 2024 security update and review.
By: Dustin Childs 2024/02/12 Read time: ( words)
Save to Folio
It’s the second patch Tuesday of the year, and Adobe and Microsoft have released a fresh crop of security updates just in time to be our Valentine. Take a break from your other activities and join us as we review the details of their latest advisories. For those interested in the Microsoft 0-day discovered by the ZDI Threat Hunting Team, you can watch this special edition of the Patch Report:
If you’d rather watch the full video recap covering the entire release, you can check out here:
CVE
Title
Severity
CVSS
Public
Exploited
Type
CVE-2024-21412
Internet Shortcut Files Security Feature Bypass Vulnerability
Important
8.
Trendmicro
The February 2024 Security Update Review
blogs_trendmicro·2024-02-12
The February 2024 Security Update Review
# The February 2024 Security Update Review
Get the Feburary 2024 security update and review.
By: Dustin Childs
2024/02/12
Read time: ( words)
Save to Folio
It’s the second patch Tuesday of the year, and Adobe and Microsoft have released a fresh crop of security updates just in time to be our Valentine. Take a break from your other activities and join us as we review the details of their latest advisories. For those interested in the Microsoft 0-day discovered by the ZDI Threat Hunting Team, you can watch this special edition of the Patch Report:
If you’d rather watch the full video recap covering the entire release, you can check out here:
Adobe Patches for February 2024
For February, Adobe released six patches addressing 29 CVEs in Adobe Acrobat and Reader, Commerce, Substance 3D
Trendmicro
The February 2024 Security Update Review
blogs_trendmicro·2024-02-12·CVSS 7.5
[HIGH] The February 2024 Security Update Review
## The February 2024 Security Update Review
Get the Feburary 2024 security update and review.
By: Dustin Childs Feb 12, 2024 Read time: ( words)
Save to Folio
It’s the second patch Tuesday of the year, and Adobe and Microsoft have released a fresh crop of security updates just in time to be our Valentine. Take a break from your other activities and join us as we review the details of their latest advisories. For those interested in the Microsoft 0-day discovered by the ZDI Threat Hunting Team, you can watch this special edition of the Patch Report:
If you’d rather watch the full video recap covering the entire release, you can check out here:
CVE
Title
Severity
CVSS
Public
Exploited
Type
CVE-2024-21412
Internet Shortcut Files Security Feature Bypass Vulnerability
Important
Trendmicro
The February 2024 Security Update Review
blogs_trendmicro·2024-02-12·CVSS 7.5
[HIGH] The February 2024 Security Update Review
## The February 2024 Security Update Review
Get the February 2024 security update and review.
By: Dustin Childs Feb 12, 2024 Read time: ( words)
Save to Folio
It’s the second patch Tuesday of the year, and Adobe and Microsoft have released a fresh crop of security updates just in time to be our Valentine. Take a break from your other activities and join us as we review the details of their latest advisories. For those interested in the Microsoft 0-day discovered by the ZDI Threat Hunting Team, you can watch this special edition of the Patch Report:
If you’d rather watch the full video recap covering the entire release, you can check out here:
CVE
Title
Severity
CVSS
Public
Exploited
Type
CVE-2024-21412
Internet Shortcut Files Security Feature Bypass Vulnerability
Important
2024-02-13
Published