Denial of Service (DoS) Affecting node-static package, versions *



    Exploit Maturity Proof of concept
    Attack Complexity Low
    Availability High

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  • Snyk ID SNYK-JS-NODESTATIC-1297183
  • published 28 May 2021
  • disclosed 28 May 2021
  • credit Unknown

Introduced: 28 May 2021

CVE NOT AVAILABLE CWE-400 Open this link in a new tab

How to fix?

A fix was pushed into the master branch but not yet published.


node-static is a rfc 2616 compliant HTTP static-file server module, with built-in caching.

Affected versions of this package are vulnerable to Denial of Service (DoS). The package fails to catch an exception when user input includes null bytes. This allows attackers to access http://host/%00 and crash the server.


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