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 Software | Affected Version | How 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 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
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/).
- collector/nvd-api
- collector/nvd-index
- agent/type
- agent/author
- agent/severity
- agent/weakness
- agent/references
- agent/description
- collector/ics-cert-advisory
- source/ICS
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- agent/softwarecombine
- agent/tags
- agent/event
- agent/first-publish-date
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/trending
- vendor/contiki-ng
- canonical/contiki-ng contiki-ng
- version/contiki-ng contiki-ng/4.5
- vendor/multiple
- canonical/multiple nut/net, version 5.1 and prior
- canonical/multiple cyclonetcp, version 1.9.6 and prior
- canonical/multiple ndktcpip, version 2.25 and prior
- canonical/multiple fnet, version 4.6.3
- canonical/multiple uip-contiki-os (end-of-life [eol]), version 3.0 and prior
- canonical/multiple uc/tcp-ip (eol), version 3.6.0 and prior
- canonical/multiple uip-contiki-ng, version 4.5 and prior
- canonical/multiple uip (eol), version 1.0 and prior
- canonical/multiple picotcp-ng, version 1.7.0 and prior
- canonical/multiple picotcp (eol), version 1.7.0 and prior
- canonical/multiple mplab net, version 3.6.1 and prior
- canonical/multiple nucleus net, all versions prior to version 5.2
- canonical/multiple nucleus readystart for arm, mips, and ppc, all versions prior to version 2012.12