Microsoft addressed CVE-2025-62562 as part of its December 2025 Patch Tuesday release. The vulnerability affects Microsoft Outlook for Windows and is classified as a high-severity remote code execution (RCE) issue with a CVSS score of 7.8. The flaw originates from improper memory handling within the Outlook client and could allow an attacker to execute arbitrary code on a victim’s system under certain conditions.
Although exploitation requires user interaction, the vulnerability is considered significant due to Outlook’s widespread use and its central role in enterprise communication environments.
Vulnerability Overview
CVE-2025-62562 is a use-after-free vulnerability (CWE-416) caused by incorrect memory management during the processing of specific Outlook content. When memory that has already been released is later accessed or reused incorrectly, it creates an opportunity for attackers to manipulate program execution.
If successfully exploited, the flaw allows an attacker to execute arbitrary code in the security context of the logged-in Outlook user. Because Outlook frequently operates with access to corporate email, internal resources, and authentication tokens, this type of vulnerability carries elevated risk in organizational environments.
Technical Characteristics
- CVE ID: CVE-2025-62562
- Severity: High
- CVSS Score: 7.8
- Attack Vector: Local (delivered remotely via email content)
- Attack Complexity: Low
- Privileges Required: None
- User Interaction: Required
- Scope: Unchanged
- Impact: High impact to confidentiality, integrity, and availability
Although the CVSS vector identifies the attack as local, the delivery mechanism is effectively remote, as attackers can transmit malicious content via email to targeted users.
Exploitation Scenario
Exploitation depends on user interaction, such as opening, replying to, or otherwise interacting with a specially crafted email message. While Microsoft indicates that the Preview Pane alone is not sufficient to trigger exploitation, interaction with malformed email content can result in execution of attacker-controlled code.
The attack complexity is low, meaning exploitation does not require uncommon system configurations or advanced techniques once the malicious content reaches the target inbox. Since no elevated privileges are required, any standard Outlook user may be affected.
At a technical level, the exploit relies on manipulating freed memory regions so that execution flow is redirected to malicious payloads embedded in the email content.
Impact and Risk Assessment
Successful exploitation enables an attacker to run arbitrary code with the same privileges as the affected user. This can lead to:
- Installation of malware or backdoors
- Theft of sensitive information and credentials
- Modification or deletion of data
- Potential lateral movement within enterprise environments
Because Outlook is often integrated with Microsoft 365 services, Active Directory, and cloud-based identity systems, a compromised Outlook client may serve as an initial foothold for broader attacks across corporate infrastructure.
The CVSS impact ratings of high confidentiality, integrity, and availability reflect the extent of damage that may occur following successful exploitation.
Affected Software
The vulnerability affects Microsoft Outlook for Windows, including:
- Standalone Outlook installations
- Outlook included with Microsoft Office
- Outlook deployed as part of Microsoft 365 Apps for enterprise
Systems running affected versions remain vulnerable until the December 2025 security updates are applied.
Exploitation Status
At the time of patch release, there were no confirmed reports of active exploitation, publicly available proof-of-concept code, or known zero-day activity associated with CVE-2025-62562. However, vulnerabilities of this type—high-severity RCE flaws in widely deployed email clients—are commonly targeted following public disclosure.
Given the realistic exploitation conditions and potential impact, timely remediation is strongly recommended.
Patch Information and Official Reference
Microsoft resolved CVE-2025-62562 in its December 2025 Patch Tuesday updates. The fix is available through standard Microsoft update channels, including Windows Update, Microsoft Update, and enterprise patch management solutions.
The official Microsoft Security Response Center advisory for this vulnerability can be found here:
Microsoft Security Guidance – CVE-2025-62562
https://msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2025-62562
This page provides authoritative details on affected products, remediation guidance, and update availability.
Conclusion
CVE-2025-62562 highlights the ongoing risks associated with memory safety vulnerabilities in widely used desktop applications. While user interaction is required for exploitation, the low attack complexity and high potential impact make this issue particularly relevant for organizations relying heavily on Outlook for daily operations.
Applying the December 2025 security updates remains the most effective mitigation and should be prioritized to reduce exposure to this vulnerability.
