CVE-2020-27213

Katalog CVE

CVSS 7.5 · High EPSS 0,97%

Kerentanan Use of Insufficiently Random Values pada ethernut nut/os. Skor CVSS 3.1 7.5 (High) menurut NVD.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

10 Oktober 2023

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

7.5 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-330: Use of Insufficiently Random Values

EPSS (30 hari)

0,97% peluang dieksploitasi; lebih tinggi dari 60,9% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01 advisory pihak ketiga · pemerintah AS
• https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/ exploit · advisory pihak ketiga
• http://lists.egnite.de/mailman/listinfo/en-nut-announce not applicable
• http://www.ethernut.de/en/download/index.html release notes