Overview
CVE-2025-27466 is a critical vulnerability found within the handling and accessing of guest memory pages in the viridian code. It pertains to a NULL pointer dereference in the updating of the reference TSC area. This vulnerability has a CVSS severity score of 9.8, representing a very high severity level, thereby causing a significant threat to organizations using the affected software. This vulnerability could lead to potential system compromise or data leakage, which could have devastating consequences for businesses and their customers.
Vulnerability Summary
CVE ID: CVE-2025-27466
Severity: Critical (9.8 CVSS)
Attack Vector: Local
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Viridian Code | All versions prior to the patch
How the Exploit Works
The exploit takes advantage of a NULL pointer dereference in the updating of the reference TSC area in the viridian code. By specifically crafting a series of commands, an attacker can cause the system to attempt to reference a location that it shouldn’t, leading to a system crash or, in more severe scenarios, execution of arbitrary code.
Conceptual Example Code
While actual exploit code is beyond the scope of this article, the following pseudocode illustrates the core concept of exploiting a NULL pointer dereference:
#include <stdio.h>
int main(){
int *ptr = NULL;
printf("The value of ptr is : %x\n", ptr);
/* Attempt to access a memory location through the null pointer */
printf("The value of *ptr is : %d\n", *ptr);
return 0;
}In this example, the pointer is initialized to NULL, and then the program attempts to access a memory location through the null pointer. In the context of the CVE-2025-27466 vulnerability, an attacker could manipulate such a scenario to make the system behave unpredictably or to execute code of their choosing.
Mitigation
The most effective way to protect against CVE-2025-27466 is to apply the vendor’s patch. If this isn’t immediately possible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can offer temporary mitigation by detecting and blocking exploit attempts.
As a broader measure, organizations should maintain a robust patching policy, ensuring that all software is kept up-to-date to protect against known vulnerabilities. Regular security assessments and penetration tests can also help identify potential weaknesses before they can be exploited.
