CVE-2020-27631

CRITICAL EPSS 61.0%
Published Oct 10, 20232y ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Critical
Find Similar
Published Oct 10, 2023 2y ago
Last Modified Jun 17, 2026 2w ago

Description

In Oryx CycloneTCP 1.9.6, TCP ISNs are improperly random.

CVSS Details

Base Score
9.8
Exploitability
3.9
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
61.0% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-330

Affected Products 1

VendorProductVersionRange
oryx-embeddedcyclonetcp1.9.6any

References 3

  • cisa.gov https://www.cisa.gov/news-events/ics-advisories/icsa-21-042-01
    Third Party AdvisoryUS Government Resource
  • forescout.com https://www.forescout.com
    Third Party Advisory
  • forescout.com https://www.forescout.com/resources/numberjack-weak-isn-generation-in-embedded-tcpip-stacks/
    Third Party Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.