7.5

CVE-2020-27213

Exploit
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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Ethernut ≫ Nut/os Version5.1
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.97% 0.573
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE-330 Use of Insufficiently Random Values

The product uses insufficiently random numbers or values in a security context that depends on unpredictable numbers.

https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01
Third Party Advisory
US Government Resource
https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/
Third Party Advisory
Exploit
http://lists.egnite.de/mailman/listinfo/en-nut-announce
Not Applicable
http://www.ethernut.de/en/download/index.html
Release Notes