Race condition in Juniper Junos OS

Published: 2020-10-15
Risk High
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2020-1667
Exploitation vector Network
Public exploit N/A
Vulnerable software
Juniper Junos OS
Operating systems & Components / Operating system

Vendor Juniper Networks, Inc.

Security Advisory

This security advisory describes one high risk vulnerability.

1) Race condition

Risk: High

CVSSv3: 7.2 [CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2020-1667

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No


The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to a race condition when DNS filtering is enabled with one of the following cards MS-PIC, MS-MIC or MS-MPC. A remote attacker can exploit the race, cause a deial of service (DoS) condition and escalate privileges on the system.


Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 17.3R1, 17.3R1-S1, 17.3R1-S2, 17.3R1-S3, 17.3R1-S4, 17.3R2, 17.3R2-S2, 17.3R2-S4, 17.3R2-S5, 17.3R3, 17.3R3-S1, 17.3R3-S2, 17.3R3-S3, 17.3R3-S4, 17.3R3-S5, 17.3R3-S6, 17.3R3-S7, 18.3R1, 18.3R1-S1, 18.3R1-S2, 18.3R1-S3, 18.3R1-S4, 18.3R1-S5, 18.3R1-S6, 18.3R1-S7, 18.3R2, 18.3R2-S1, 18.3R2-S2, 18.3R2-S3, 18.3R2-S4, 18.3R3, 18.4R1, 18.4R1-S1, 18.4R1-S2, 18.4R1-S3, 18.4R1-S4, 18.4R1-S5, 18.4R1-S6, 18.4R1-S7, 18.4R2, 18.4R2-S1, 18.4R2-S2, 18.4R2-S3, 18.4R2-S4, 18.4R2-S5, 19.1R, 19.1R1, 19.1R1-S1, 19.1R1-S2, 19.1R1-S3, 19.1R1-S4, 19.1R1-S5, 19.1R2, 19.1R2-S1, 19.1R2-S2, 19.2R1, 19.2R1-S1, 19.2R1-S2, 19.2R1-S3, 19.2R1-S4, 19.2R1-S5, 19.3R1, 19.3R1-S1, 19.3R2, 19.3R2-S1, 19.3R2-S2, 19.3R2-S3, 19.3R2-S4

CPE External links


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.