CWE
330
Advisory Published
Updated

CVE-2020-27634

First published: Tue Oct 10 2023(Updated: )

In Contiki 4.5, TCP ISNs are improperly random.

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Contiki-ng Contiki-ng=4.5
Multiple Nut/Net, Version 5.1 and prior
Multiple CycloneTCP, Version 1.9.6 and prior
Multiple NDKTCPIP, Version 2.25 and prior
Multiple FNET, Version 4.6.3
Multiple uIP-Contiki-OS (end-of-life [EOL]), Version 3.0 and prior
Multiple uC/TCP-IP (EOL), Version 3.6.0 and prior
Multiple uIP-Contiki-NG, Version 4.5 and prior
Multiple uIP (EOL), Version 1.0 and prior
Multiple picoTCP-NG, Version 1.7.0 and prior
Multiple picoTCP (EOL), Version 1.7.0 and prior
Multiple MPLAB Net, Version 3.6.1 and prior
Multiple Nucleus NET, All versions prior to Version 5.2
Multiple Nucleus ReadyStart for ARM, MIPS, and PPC, All versions prior to Version 2012.12

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Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2020-27634?

    CVE-2020-27634 is a vulnerability in Contiki 4.5 where TCP ISNs are improperly random.

  • How severe is CVE-2020-27634?

    CVE-2020-27634 has a severity rating of 9.1 (critical).

  • How does CVE-2020-27634 affect Contiki-ng Contiki-ng 4.5?

    CVE-2020-27634 affects Contiki-ng Contiki-ng 4.5 by improperly randomizing TCP ISNs.

  • How can I fix CVE-2020-27634?

    To fix CVE-2020-27634, update to a patched version of Contiki-ng Contiki-ng 4.5 or apply any available security patches.

  • Are there any references for CVE-2020-27634?

    Yes, you can find references for CVE-2020-27634 at the following links: [Link 1](https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01), [Link 2](https://www.forescout.com), [Link 3](https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/).

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