Improper Randomness in TCP Initial Sequence Numbers in Microchip Product
CVE-2020-27636

9.1CRITICAL

Key Information:

Vendor

Microchip

Status
Mplab Network Creator
Vendor
CVE Published:
10 October 2023

What is CVE-2020-27636?

Microchip MPLAB Net 3.6.1 exhibits an improper implementation of randomness in the generation of TCP Initial Sequence Numbers (ISNs). This weakness can expose systems to various network-based attacks, enabling adversaries to potentially predict sequence numbers and hijack TCP sessions. It is crucial for organizations using this product to assess their security posture and implement necessary mitigations to safeguard against exploitation.

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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

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