Denial of Service (DoS) Affecting org.eclipse.californium:scandium package, versions [2.3.0, 2.6.1)



    Attack Complexity High
    Availability High
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7.5 high

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  • published 4 Feb 2021
  • disclosed 4 Feb 2021
  • credit Unknown

How to fix?

Upgrade org.eclipse.californium:scandium to version 2.6.1 or higher.


org.eclipse.californium:scandium is a library for exchanging data using DTLS over UDP.

Affected versions of this package are vulnerable to Denial of Service (DoS). The certificate based (x509 and RPK) DTLS handshakes accidentally fails, because it sticks to a wrong internal state. That wrong internal state is set by a previous certificate based DTLS handshakes failure with TLS parameter mismatch. The server must be restarted to recover this. This allow clients to force a DoS.


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