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2021-07 Security Bulletin: Steel-Belted Radius Carrier Edition: Remote code execution vulnerability when EAP Authentication is configured. (CVE-2021-0276)



Article ID: JSA11180 SECURITY_ADVISORIES Last Updated: 14 Jul 2021Version: 1.0
Product Affected:
This issue affects SBR Carrier 8.4.1, 8.5.0, 8.6.0.

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.

This issue affects SBR Carrier with EAP authentication configured only when using Enhanced EAP Logging and TraceLevel setting of 2.

EnhancedEAPLogging = yes

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2021-0276.


The following software releases have been updated to resolve this specific issue: 8.4.1R19, 8.5.0R10, 8.6.0R4 and all subsequent releases.

This issue is being tracked as 1465201.


There are no viable workarounds for this issue.

Software releases or updates are available for download at
Modification History:
2021-07-14: Initial Publication.

CVSS Score:
9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Severity Level:
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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