Race condition in Juniper Junos OS - CVE-2021-0247
Published: April 16, 2021
Vulnerability identifier: #VU52284
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-0247
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Juniper Networks, Inc.
Affected software:
Juniper Junos OS
Juniper Junos OS
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to a race condition in the firewall process (dfwd). A remote attacker can bypass the firewall rule sets applied to the input loopback filter on any interfaces of a device.
How to mitigate CVE-2021-0247
Install updates from vendor's website.