Cyber Resilience

CVE-2020-27631

Critical

Published: 10 October 2023

Published
10 October 2023
Modified
21 November 2024
KEV Added
—
Patch
—
CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0018 40.0th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2020-27631 is a critical-severity Use of Insufficiently Random Values (CWE-330) vulnerability in Oryx-Embedded Cyclonetcp. Its CVSS base score is 9.8 (Critical).

Operationally, ranked at the 40.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

In Oryx CycloneTCP 1.9.6, TCP ISNs are improperly random.

CWE(s)
CWE-330

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

oryx-embedded
cyclonetcp
1.9.6

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

SC-12 Cryptographic Key Establishment and Management
addresses: CWE-330

Key generation under controlled management uses approved random-bit sources rather than insufficiently random values.

References