A Double Free vulnerability in the software forwarding interface daemon (sfid) process of Juniper Networks Junos OS allows an adjacently-connected attacker to cause a Denial of Service (DoS) by sending a crafted ARP packet to the device.

Continued receipt and processing of the crafted ARP packets will create a sustained Denial of Service (DoS) condition.

This issue affects:

Juniper Networks Junos OS on EX2200-C Series, EX3200 Series, EX3300 Series, EX4200 Series, EX4500 Series, EX4550 Series, EX6210 Series, EX8208 Series, EX8216 Series.

• 12.3 versions prior to 12.3R12-S17;
• 15.1 versions prior to 15.1R7-S8.

This issue only affects the listed Marvell-chipset based EX Series devices. No other products or platforms are affected.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned  CVE-2021-0271 .

The following software releases have been updated to resolve this specific issue: Junos OS: 12.3R12-S17, 15.1R7-S8, and all subsequent releases.

This issue is being tracked as  1497768 .

Software releases or updates are available for download at https://support.juniper.net/support/downloads/

2021-04-14: Initial Publication.
2022-03-21: Shortened title

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2021-0271 at cve.mitre.org