SyncBreeze 15.2.24 Denial of Service via Login Endpoint Overflow

Advisories

severity: medium
date: December 15, 2025
Affecting: SyncBreeze 15.2.24
CVE: CVE-2023-53873
CWE: CWE-400 Uncontrolled Resource Consumption
CVSS: 8.7
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References: ExploitDB-51725
SyncBreeze Product Webpage
Credit: mohamed youssef
Description: SyncBreeze 15.2.24 contains a denial of service vulnerability in the login authentication mechanism that allows attackers to crash the service. Attackers can send an oversized password parameter with repeated 'password=' values to overwhelm the login endpoint and potentially disrupt service availability.