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CVE-2021-0276

Steel-Belted Radius Carrier Edition: Remote code execution vulnerability when EAP Authentication is configured.

CRITICAL
9.8
CVSS Score
Published: July 15, 2021 at 08:00 PM UTC
Updated: June 17, 2026 at 03:29 AM UTC
2 products affected across 2 vendorsSteel Belted Radius CarrierSBR Carrier

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Severity
CRITICAL9.8
Exploit prediction
EPSS 2%

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Steel Belted Radius Carrier· Juniper
95%
8.4.18.4.1 r138.5.08.5.0 r48.6.0
SBR Carrier· Juniper Networks
60%
8.4.1 ≤ v < 8.4.1R198.5.0 ≤ v < 8.5.0R108.6.0 ≤ v < 8.6.0R48.4.18.5.08.6.0
Affected range stops below 8.4.1R19, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.5.0R10, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.6.0R4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://kb.juniper.net/JSA11180

CVSS

9.8CRITICALjuniper
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-121CWE-787

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