Is CVE-2021-0276 actively exploited?

No active exploitation of CVE-2021-0276 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-0276 be exploited remotely?

Yes. CVE-2021-0276 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-0276?

CVE-2021-0276 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-0276

CRITICAL

CVE-2021-0276

CWE-121Published: July 15, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-0276 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.