An 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.
History

Thu, 19 Sep 2024 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2023-10-10T00:00:00

Updated: 2024-09-19T15:40:41.539Z

Reserved: 2020-10-19T00:00:00

Link: CVE-2020-27213

cve-icon Vulnrichment

Updated: 2024-08-04T16:11:35.970Z

cve-icon NVD

Status : Analyzed

Published: 2023-10-10T17:15:10.337

Modified: 2023-10-27T19:34:58.647

Link: CVE-2020-27213

cve-icon Redhat

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