CVE-2020-27213

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Summary

CVECVE-2020-27213
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-10-10 17:15:00 UTC
Updated2023-10-27 19:34:00 UTC
DescriptionAn issue was discovered in Ethernut Nut/OS 5.1. The code that generates Initial Sequence Numbers (ISNs) for TCP connections derives the ISN from an insufficiently random source. As a result, an attacker may be able to determine the ISN of current and future TCP connections and either hijack existing ones or spoof future ones. While the ISN generator seems to adhere to RFC 793 (where a global 32-bit counter is incremented roughly every 4 microseconds), proper ISN generation should aim to follow at least the specifications outlined in RFC 6528.

Risk And Classification

Problem Types: CWE-330

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Ethernut Nut/os 5.1 All All All

References

ReferenceSourceLinkTags
Ethernut Download MISC www.ethernut.de
En-Nut-Announce Info Page MISC lists.egnite.de
Multiple Embedded TCP/IP Stacks (Update B) | CISA MISC www.cisa.gov
403 Forbidden MISC www.forescout.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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