Overview
A newly identified vulnerability, CVE-2025-29448, affects the popular booking application, Easy!Appointments v1.5.1. This critical flaw allows unauthenticated attackers to exploit the booking logic and create appointments with excessively long durations, resulting in a denial of service by blocking all future booking availability. It presents a significant risk, potentially leading to system compromise and data leakage.
Vulnerability Summary
CVE ID: CVE-2025-29448
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of service, potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Easy!Appointments | v1.5.1
How the Exploit Works
The exploit leverages a flaw in the booking logic of Easy!Appointments v1.5.1. An unauthenticated attacker can create appointments with excessively long durations. The prolonged booking duration then blocks all future booking availability, leading to a denial of service. This could potentially compromise the system or lead to data leakage.
Conceptual Example Code
Here is a conceptual example of an HTTP POST request that an attacker might use to exploit this vulnerability:
POST /booking/create HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"appointment_duration": 999999999,
"appointment_start": "2025-12-31T00:00:00"
}In this example, the attacker sets the “appointment_duration” to an excessively long value, thereby blocking future bookings. The “appointment_start” is set to a future date, causing the system to indefinitely wait for the appointment to finish, resulting in a denial of service.
Mitigation Guidance
To mitigate this vulnerability, it is recommended to apply the patch provided by the vendor immediately. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as a temporary mitigation measure, restricting the ability of an attacker to submit overly long appointment durations.