Denial of Service (DoS) Affecting parse-server package, versions <4.10.12 >=5.0.0 <5.2.3



    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.09% (38th percentile)
Expand this section
7.5 high

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  • published 20 Jun 2022
  • disclosed 20 Jun 2022
  • credit mtrezza

How to fix?

Upgrade parse-server to version 4.10.12, 5.2.3 or higher.


parse-server is a version of the Parse backend that can be deployed to any infrastructure that can run Node.js.

Affected versions of this package are vulnerable to Denial of Service (DoS) due to certain types of invalid files requests are not handled properly.

Note: If you are running multiple Parse Server instances in a cluster, the availability impact may be low. If you are running Parse Server as a single instance without redundancy, the availability impact may be high.


Denial of Service (DoS) describes a family of attacks, all aimed at making a system inaccessible to its intended and legitimate users.

Unlike other vulnerabilities, DoS attacks usually do not aim at breaching security. Rather, they are focused on making websites and services unavailable to genuine users resulting in downtime.

One popular Denial of Service vulnerability is DDoS (a Distributed Denial of Service), an attack that attempts to clog network pipes to the system by generating a large volume of traffic from many machines.

When it comes to open source libraries, DoS vulnerabilities allow attackers to trigger such a crash or crippling of the service by using a flaw either in the application code or from the use of open source libraries.

Two common types of DoS vulnerabilities:

  • High CPU/Memory Consumption- An attacker sending crafted requests that could cause the system to take a disproportionate amount of time to process. For example, commons-fileupload:commons-fileupload.

  • Crash - An attacker sending crafted requests that could cause the system to crash. For Example, npm ws package