SB2021041601 - Firewall filters bypass in Juniper Junos OS
Published: April 16, 2021
Security Bulletin ID
SB2021041601
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Race condition (CVE-ID: CVE-2021-0247)
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.
Remediation
Install update from vendor's website.