CVE-2020-27631
First published: Tue Oct 10 2023(Updated: )
In Oryx CycloneTCP 1.9.6, TCP ISNs are improperly random.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| open-iscsi | ||
| CycloneTCP | ||
| Multiple NDKTCPIP, Version 2.25 and prior | ||
| butok FNET | ||
| Contiki OS | ||
| uC/TCP-IP | ||
| Contiki-NG | ||
| uIP (EOL) | ||
| altran picoTCP-NG | ||
| picoTCP | ||
| MPLAB Net | ||
| Multiple Nucleus NET | ||
| Multiple Nucleus ReadyStart for ARM, MIPS, and PPC | ||
| CycloneTCP | =1.9.6 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2020-27631?
CVE-2020-27631 is considered a high severity vulnerability due to the improper randomness of TCP Initial Sequence Numbers.
How do I fix CVE-2020-27631?
To mitigate CVE-2020-27631, update to a version of CycloneTCP that has addressed the ISN generation issue.
What types of software are affected by CVE-2020-27631?
CVE-2020-27631 affects Oryx CycloneTCP 1.9.6 and several other TCP/IP stacks including various versions of Nut/Net, NDKTCPIP, and uIP.
What is the impact of exploiting CVE-2020-27631?
Exploiting CVE-2020-27631 can allow attackers to predict the TCP sequence numbers, leading to potential session hijacking or man-in-the-middle attacks.
Are there any workarounds for CVE-2020-27631?
As of now, updating to a patched version is the primary way to mitigate CVE-2020-27631, as there are no effective workarounds.
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- canonical/open-iscsi
- canonical/cyclonetcp
- canonical/multiple ndktcpip, version 2.25 and prior
- canonical/butok fnet
- canonical/contiki os
- canonical/uc/tcp-ip
- canonical/contiki-ng
- canonical/uip (eol)
- canonical/altran picotcp-ng
- canonical/picotcp
- canonical/mplab net
- canonical/multiple nucleus net
- canonical/multiple nucleus readystart for arm, mips, and ppc
- vendor/oryx-embedded
- version/cyclonetcp/1.9.6