Overview
The CVE-2025-53734 vulnerability is a significant security flaw that affects Microsoft Office Visio, a crucial tool widely used for creating diagrams and flowcharts. This vulnerability stems from a use-after-free condition, which, if exploited, allows an unauthorized attacker to execute code locally. Given the widespread usage of Microsoft Office Visio across various sectors, this vulnerability could potentially affect a large number of users, thus making it a matter of grave concern.
Vulnerability Summary
CVE ID: CVE-2025-53734
Severity: High (7.8 – CVSS Severity Score)
Attack Vector: Local
Privileges Required: None
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Microsoft Office Visio | All prior to patch
How the Exploit Works
The vulnerability arises from a use-after-free condition in Microsoft Office Visio. A use-after-free vulnerability occurs when a piece of memory is freed (or de-allocated) but is still referenced later in the program. This can lead to unexpected behavior, including the potential for an attacker to manipulate the program to execute arbitrary code.
In this case, an attacker who successfully exploits this vulnerability could execute code locally. This could enable the attacker to gain the same user rights as the current user, potentially leading to system compromise or data leakage.
Conceptual Example Code
Below is a hypothetical example showing how an attacker could possibly exploit this vulnerability. The attacker sends a specially crafted Visio file, which contains malicious code, to the victim.
POST /upload/visiofile HTTP/1.1
Host: target.example.com
Content-Type: application/vnd.ms-visio.drawing
{ "visio_file": "[base64_encoded_malicious_visio_file]" }In this example, if the victim opens the malicious Visio file, the use-after-free condition is triggered, allowing the attacker’s code to be executed.
It’s important to note that this is a simplified example for illustrative purposes only. Actual exploit code would likely be more complex and specific to the vulnerability in question.
Mitigation and Prevention
Microsoft has already released a patch to address this vulnerability. Users are strongly advised to apply this patch as soon as possible. If immediate patching is not feasible, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation method. However, these are not long-term solutions and can only minimize risk, not eliminate it. Permanent mitigation can only be achieved by applying the vendor’s patch.
