CVE-2021-26788: Oryx-Embedded Cyclonetcp

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

Oryx Embedded CycloneTCP 1.7.6 to 2.0.0, fixed in 2.0.2, is affected by incorrect input validation, which may cause a denial of service (DoS). To exploit the vulnerability, an attacker needs to have TCP connectivity to the target system. Receiving a maliciously crafted TCP packet from an unauthenticated endpoint is sufficient to trigger the bug.

Affected products

• Oryx-Embedded Cyclonetcp: from 1.7.6, up to and including 2.0.0

Published 2021-03-08. Last modified 2026-06-17.