Overview
The CVE-2025-9182 vulnerability is a critical denial-of-service (DoS) issue that impacts the Graphics: WebRender component in certain versions of Firefox and Thunderbird. Exploiting this vulnerability can lead to out-of-memory scenarios, potentially compromising the system or leading to data leakage. This vulnerability poses a significant threat to organizations and individuals using affected versions of these software products.
Vulnerability Summary
CVE ID: CVE-2025-9182
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: System compromise or data leakage due to Denial-of-Service (DoS)
Affected Products
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Product | Affected Versions
Firefox | < 142 Firefox ESR | < 140.2 Thunderbird | < 142 Thunderbird ESR | < 140.2 How the Exploit Works
An attacker exploiting this vulnerability would send specially crafted data to the affected software. This data causes the Graphics: WebRender component to exhaust memory resources, resulting in a denial-of-service condition. This could potentially allow the attacker to execute arbitrary code or access sensitive information.
Conceptual Example Code
Below is a conceptual example of how the vulnerability might be exploited. This is not a real exploit, but it provides an idea of how an attacker might leverage this vulnerability:
POST /api/render HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"render_data": "<Long string of data causing memory exhaustion>"
}In this example, the attacker sends a long string of data via a POST request to the vulnerable render API endpoint, causing an out-of-memory condition and triggering the vulnerability.
