CVE-2020-36946CWE-770

SyncBreeze 10.0.28 - 'login' Denial of Service

High · published January 27, 2026

CVSS v4.0
8.7
EPSS
1%
Percentile
53.6
In the wild
Unconfirmed
What it is

⚡ A simple oversized login request is all it takes to bring down SyncBreeze! This denial of service vulnerability in version 10.0.28 can make your service unresponsive with just one crafty payload. 🔥 Think of it like a coffee shop where an overzealous customer tries to order every drink on the menu at once, overwhelming the baristas and shutting down service for everyone else. In this case, attackers can send massive login requests to crash the app completely. The consequences could be absolutely devastating! If successful, attackers could render your application unavailable, causing frustration for users and potential loss of business. Imagine being locked out when the coffee shop ran out of coffee altogether – no one likes that!

Put simply

Think of it like a coffee shop where an overzealous customer tries to order every drink on the menu at once, overwhelming the baristas and shutting down service for everyone else. In this case, attackers can send massive login requests to crash the app completely. This vulnerability allows remote attackers to exploit the login endpoint by submitting oversized payloads, which overwhelms the application and leads to a denial of service. It’s like a traffic jam caused by too many vehicles trying to enter an intersection at once, causing a gridlock.

What to do

The consequences could be absolutely devastating! If successful, attackers could render your application unavailable, causing frustration for users and potential loss of business. Imagine being locked out when the coffee shop ran out of coffee altogether – no one likes that! To protect against this vulnerability, immediately update to the latest version of SyncBreeze that includes the fix. You should also implement input validation to ensure that requests don't exceed a certain size. Monitoring for unusual traffic patterns can also help you spot potential attacks before they impact users. You've got this! With the right steps, you can keep your service running smoothly and maintain your security hero status! 🛡️

The record
Technical detail
CVSS v4.0
8.7 · HIGH
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
EPSS
0.00727 · 53.6th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-01-27T15:23Z
EPSS history
Timeline
  • 27 JAN 15:23Z
    SyncBreeze 10.0.28 - 'login' Denial of Service
    cvelistv5