Is CVE-2020-35685 in the CISA KEV catalog?

No. CVE-2020-35685 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-35685?

CVE-2020-35685 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2020-35685?

CVE-2020-35685 has an EPSS score of 2.05% (79th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-35685?

Upgrade sentron 3wa com190 firmware to 2.0.0 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2020-35685

CRITICALEPSS 79th pctl

9.1

CVSS v3

NVD

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.)

CWE-330

How to fix

Remediation Available

sentron 3wa com190 firmwareNVD

Affected:< 2.0.0Fixed in:2.0.0CVE-2020-35685derived from NVD

sentron 3wl com35 firmwareNVD

Affected:< 1.2.0Fixed in:1.2.0CVE-2020-35685derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploit Intelligence

2.05%probability of exploitation in 30 days

79thpercentile

Elevated risk: more likely to be exploited than 79% of all known CVEs.

References

Mitigation2

Third-Party Advisory1

kb.cert.org

Product1

hcc-embedded.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.