Actively exploited in the wild
Microsoft Outlook Security Feature Bypass Vulnerability
Microsoft - Outlook · Listed in the CISA KEV since 2023-07-11. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions or discontinue use of the product if updates are unavailable.
CVE-2023-35311
HighCVSS 8.8KEVExploitation Probability (EPSS)
Very high risk96th percentile - higher than 96% of all known CVEs
Summary
A vulnerability in Microsoft Outlook allows for a security feature bypass, potentially leading to unauthorized access to user data.
Risk Assessment
Organizations may be exposed to data leaks and other attacks that could exploit this vulnerability to gain access to sensitive information.
Recommendation
It is recommended to update Microsoft Outlook to the latest version to patch this vulnerability and to monitor systems for unauthorized access.
Other vulnerabilities in Microsoft Outlook
See all- CVE-2025-21361High
A vulnerability in Microsoft Outlook allows for remote code execution, potentially enabling an attacker to take control of the user's system. This flaw can be exploited by sending a specially crafted email.
- CVE-2017-11776High
Microsoft Outlook 2016 allows an attacker to obtain the email content of a user due to how it discloses this information.
- CVE-2017-8663High
Microsoft Outlook versions 2007 SP3, 2010 SP2, 2013 SP1, 2013 RT SP1, and 2016 contain a remote code execution vulnerability due to improper parsing of specially crafted email messages.
- CVE-2017-8571High
Microsoft Outlook versions 2007 SP3, 2010 SP2, 2013 SP1, 2013 RT SP1, and 2016 contain a vulnerability that allows a security feature bypass due to the way it handles input.
- CVE-2016-3278High
Microsoft Outlook 2010 SP2, 2013 SP1, 2013 RT SP1, and 2016 contains a vulnerability that allows remote attackers to execute arbitrary code via a crafted Office document.
- CVE-2024-21413CriticalActively exploited
Remote code execution vulnerability in Microsoft Outlook. Allows an attacker to execute code remotely on the victim's machine.
- CVE-2024-21378High
Remote code execution vulnerability in Microsoft Outlook. Allows an attacker to execute code remotely in the context of the user.
- CVE-2023-33131High
A vulnerability in Microsoft Outlook allows for remote code execution, potentially leading to full control over the user's system. An attacker can exploit this flaw through specially crafted email messages.
- CVE-2023-23397CriticalActively exploited
Microsoft Outlook Elevation of Privilege Vulnerability. Technical details are not provided in the description.
- CVE-1999-1164Medium
The Microsoft Outlook client allows remote attackers to cause a denial of service by sending multiple email messages with the same X-UIDL headers, which causes Outlook to hang.
Original NVD description (English source)
Microsoft Outlook Security Feature Bypass Vulnerability
Vulnerability data from NVD (NIST) · CISA KEV · EPSS