How severe is CVE-2020-35685?

This vulnerability has a severity rating of CRITICAL with a CVSS score of 9.1 out of 10.

What type of vulnerability is CVE-2020-35685?

This is classified as CWE-330, which is a common weakness in software security.

CVE-2020-35685

CRITICAL Year: 2020

CVSS v3 Score

9.1

Critical

CVSS v2 Score

6.4

Medium

Weakness Type

CWE-330

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Vulnerability Description

An issue was discovered in HCC Nichestack 3.0. 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. (Proper ISN generation should aim to follow at least the specifications outlined in RFC 6528.)

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CVSS:9.1(Critical)

A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Ve...

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CWE-3302020