Improper Randomization in TCP ISNs in Contiki by Forescout
CVE-2020-27634

9.1CRITICAL

Key Information:

Vendor

Contiki-ng

Status
Contiki-ng
Vendor
CVE Published:
10 October 2023

What is CVE-2020-27634?

In Contiki 4.5, the implementation of TCP Initial Sequence Numbers (ISNs) is flawed due to improper randomization, which may expose systems to various network-based attacks. Attackers can potentially predict ISN values, allowing for session hijacking and unauthorized access. This vulnerability highlights the importance of secure coding practices in embedded systems' communication protocols to prevent exploitation.

References

https://www.forescout.com
https://www.cisa.gov/news-events/ics-advisories/icsa-21-0...
https://www.forescout.com/resources/numberjack-weak-isn-g...

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.