CVE-2023-53873

HIGH

SyncBreeze 15.2.24 - Denial of Service via Login Endpoint Password Parameter Overflow

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2023-53873. PoCs published by mohamed youssef.

AI-analyzed exploit summary This exploit sends a malformed HTTP POST request with an excessively long 'password' parameter to SyncBreeze 15.2.24, causing a denial of service (DoS). The attack leverages a buffer overflow vulnerability in the login handling mechanism.

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.

Exploits (1)

exploitdb WORKING POC
by mohamed youssef · pythondoswindows
https://www.exploit-db.com/exploits/51725

This exploit sends a malformed HTTP POST request with an excessively long 'password' parameter to SyncBreeze 15.2.24, causing a denial of service (DoS). The attack leverages a buffer overflow vulnerability in the login handling mechanism.

Classification
Working Poc 90%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: SyncBreeze 15.2.24
No auth needed
Prerequisites: Network access to the target · SyncBreeze service running on port 80
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (3)

Core 3
Core References
Exploit, Third Party Advisory exploit
https://www.exploit-db.com/exploits/51725
Various Sources product
https://www.syncbreeze.com/

Scores

CVSS v4 8.7
EPSS 0.0039
EPSS Percentile 30.4%
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-400
Status published
Products (1)
Syncbreeze/SyncBreeze 15.2.24
Published Dec 15, 2025
Tracked Since Feb 18, 2026