CVE-2020-27213 describes a vulnerability in Ethernut Nut/OS 5.1 where the TCP Initial Sequence Number (ISN) generation uses an insufficiently random source, making ISNs predictable. This flaw allows attackers to determine current and future ISNs, potentially leading to TCP connection hijacking or spoofing. With a CVSS score of 7.5 (High), the vulnerability is network-exploitable with low attack complexity, impacting integrity by allowing unauthorized modification of data. There is no evidence of active exploitation, nor are there publicly available exploit modules in Metasploit or Nuclei, despite some community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
5.1CPE matchmatch criteria | cpe:2.3:o:ethernut:nut\/os:5.1:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.