On SRX Series devices configured with UTM services a buffer overflow vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS may allow an attacker to arbitrarily execute code or commands on the target to take over or otherwise impact the device by sending crafted packets to or through the device.

This issue affects:

Juniper Networks Junos OS on SRX Series:

• 15.1X49 versions prior to 15.1X49-D190;
• 17.4 versions prior to 17.4R2-S9;
• 17.4R3 and later versions prior to 18.1R3-S9;
• 18.2 versions prior to 18.2R3-S1;
• 18.3 versions prior to 18.3R2-S3, 18.3R3;
• 18.4 versions prior to 18.4R2-S3, 18.4R3;
• 19.1 versions prior to 19.1R1-S4, 19.1R2;
• 19.2 versions prior to 19.2R1-S1, 19.2R2.

An indicator of compromise can be the following text in the UTM log:

The following minimal configuration is required to be potentially exposed to this issue:

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

This issue was found during internal product security testing or research.

This issue has been assigned  CVE-2021-0249 .

The following software releases have been updated to resolve this specific issue: 15.1X49-D190, 17.4R2-S9, 18.1R3-S9, 18.2R3-S1, 18.3R2-S3, 18.3R3, 18.4R2-S3, 18.4R3, 19.1R1-S4, 19.1R2, 19.2R1-S1, 19.2R2, 19.3R1, and all subsequent releases.

This issue is being tracked as  1441366 .

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

2021-04-14: Initial Publication.

• 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-2021-0249 at cve.mitre.org