CVE-2021-0276 | Steel-Belted Radius Carrier Edition: Remote code execution vulnerability when EAP Authentication is configured.

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.

Published: 2021-07-15 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-0276 is rated High Risk (68.1/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.63%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-0276

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-11-21 3.59% 2.63% -0.96%
2 2025-11-18 2.63% 3.59% +0.96%
3 2025-09-22 — 2.63% —

Full EPSS history (16 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-0276

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2021-0276

Affected software / configurations for CVE-2021-0276

Vendor Product Version Raw CPE
juniper steel-belted_radius_carrier 8.4.1 cpe:2.3:a:juniper:steel-belted_radius_carrier:8.4.1:-:*:*:*:*:*:*
juniper steel-belted_radius_carrier 8.4.1 cpe:2.3:a:juniper:steel-belted_radius_carrier:8.4.1:r13:*:*:*:*:*:*
juniper steel-belted_radius_carrier 8.5.0 cpe:2.3:a:juniper:steel-belted_radius_carrier:8.5.0:-:*:*:*:*:*:*
juniper steel-belted_radius_carrier 8.5.0 cpe:2.3:a:juniper:steel-belted_radius_carrier:8.5.0:r4:*:*:*:*:*:*
juniper steel-belted_radius_carrier 8.6.0 cpe:2.3:a:juniper:steel-belted_radius_carrier:8.6.0:*:*:*:*:*:*:*

References for CVE-2021-0276

URL Tags
https://kb.juniper.net/JSA11180 Vendor Advisory
cvelogic Threat Intelligence