What is CVE-2021-0244?

CVE-2021-0244 is a high-severity vulnerability in Juniper Ex2300, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.4/10. Published 2021-04-22.

How severe is CVE-2021-0244?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Juniper Ex2300

CVE-2021-0244

A signal handler race condition exists in the Layer 2 Address Learning Daemon (L2ALD) of Juniper Networks Junos OS due to the absence of a specific protection mechanism to avoid a race condition which may allow an attacker to bypass the st…

Vulnerability class: Race Condition

EPSS: 0.006 (45.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H.

Affected products

Juniper Ex2300
Juniper Ex2300-c
Juniper Ex3400
Juniper Ex4300
Juniper Ex4400
Juniper Ex4600
Juniper Ex4650
Juniper Ex9200
Juniper Ex9250
Juniper Junos — versions 14.1x53, 15.1, 16.1

Weakness classification (CWE)

CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition)

References

sirt@juniper.net (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2021-0244?: CVE-2021-0244 is a high-severity vulnerability in Juniper Ex2300, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.4/10. Published 2021-04-22.
How severe is CVE-2021-0244?: High severity. CVSS v3 base score is 7.4 out of 10.