CVE-2025-53733 is a high-severity vulnerability affecting Microsoft Office Word. This vulnerability allows unauthorized attackers to execute code locally due to incorrect conversion between numeric types. With a CVSS score of 8.4, it poses a significant risk to organizations that rely on Microsoft Office products. Attackers may leverage this vulnerability to gain unauthorized access to systems and data, thereby jeopardizing sensitive information.
The potential impact of this vulnerability is extensive, as it can lead to unauthorized code execution, which may facilitate further exploitation or compromise of other systems within the network. Given the high profile of Microsoft products, organizations must take immediate action to address this vulnerability.
As of now, there are no known exploits available for this vulnerability, but the high exploitability score indicates that it is critical for organizations to remain vigilant. Organizations should prioritize patching immediately to mitigate the risks associated with CVE-2025-53733.
In summary, the urgency for defenders cannot be overstated. Organizations using Microsoft Office products, particularly Word, must act swiftly to secure their environments against this vulnerability.
Vulnerability Details
The official description of CVE-2025-53733 states that this vulnerability allows an unauthorized attacker to execute code locally due to incorrect conversion between numeric types in Microsoft Office Word. The vulnerability is classified under CWE-681. The CVSS 3.1 score is 8.4, indicating high severity, with an attack vector of LOCAL and low attack complexity.
Affected products include Microsoft Office 365 apps, Word 2016, SharePoint Server 2019, and other components within the Office ecosystem. The vulnerability was published on August 12, 2025.
Technical Analysis
The root cause of CVE-2025-53733 lies in the incorrect conversion between numeric types within Microsoft Office Word. This flaw allows attackers to exploit the application to execute arbitrary code locally. The attack vector is local, meaning that an attacker must have local access to the vulnerable system, but the attack complexity is low, requiring no special privileges or user interaction.
The impact on confidentiality, integrity, and availability is rated as high. Attackers may exploit this vulnerability to access sensitive data, modify documents, or disrupt service availability, leading to significant ramifications for organizations.
Risk & Impact Analysis
Risk to organizations includes unauthorized access to sensitive documents, the potential for data breaches, and disruptions to business continuity. The blast radius of this vulnerability is substantial, as it affects a wide range of Microsoft Office products used globally. Organizations should assess their exposure based on the CVSS score and prioritize remediation efforts accordingly.
Given the high exploitability and the nature of the vulnerability, organizations are urged to patch their systems immediately. The absence of known exploits does not mitigate the importance of addressing this vulnerability in a timely manner.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions include Microsoft Office 365 apps, Office 2019, SharePoint Enterprise Server 2016, and Word 2016. All versions prior to vendor patch are vulnerable.
Mitigation & Remediation
Organizations should prioritize patching immediately to remediate this vulnerability. To ensure security, always keep Microsoft Office products updated with the latest security patches. For additional guidance, organizations may consider engaging in penetration testing to validate the effectiveness of their security measures.
Detection Guidance
Monitoring for unusual activities in Microsoft Office applications can help detect potential exploitation attempts. Key indicators include unexpected application behavior, unusual file access patterns, and unauthorized changes to documents.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-53733 lies in its implications for software integrity and security in Microsoft products. This vulnerability represents a trend where improper handling of data types can lead to severe security flaws. Security teams should learn from this incident and implement strict coding reviews and testing protocols to prevent similar vulnerabilities.
Organizations should also enhance their security posture by adopting a comprehensive penetration testing methodology to continuously identify and remediate vulnerabilities.
Finally, organizations must remain vigilant and proactive in their security practices. Adopting a strategy that incorporates both proactive and reactive measures will significantly reduce the risk of exploitation in the future.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)