CVE-2021-0276: Juniper Steel-Belted Radius Carrier

Critical severity, CVSS 9.8. EPSS: 2.3% chance of exploitation in the next 30 days.

A stack-based Buffer Overflow vulnerability in Juniper Networks SBR Carrier with EAP (Extensible Authentication Protocol) authentication configured, allows an attacker sending specific packets causing the radius daemon to crash resulting with a Denial of Service (DoS) or leading to remote code execution (RCE). By continuously sending this specific packets, an attacker can repeatedly crash the radius daemon, causing a sustained Denial of Service (DoS). This issue affects Juniper Networks SBR Carrier: 8.4.1 versions prior to 8.4.1R19; 8.5.0 versions prior to 8.5.0R10; 8.6.0 versions prior to 8.6.0R4.

Affected products

• Juniper Steel-Belted Radius Carrier: version 8.4.1 only; version 8.5.0 only; version 8.6.0 only

Published 2021-07-15. Last modified 2026-06-17.