Resource management error in Junos OS and Junos OS Evolved - CVE-2021-0287
Published: July 19, 2021
Vulnerability identifier: #VU54988
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-0287
CWE-ID: CWE-399
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to improper management of internal resources within the application. In an Segment Routing ISIS (SR-ISIS)/MPLS environment, on Juniper Networks Junos OS and Junos OS Evolved devices, configured with ISIS Flexible Algorithm for Segment Routing and sensor-based statistics, a flap of a ISIS link in the network, can lead to a routing process daemon (RPD) crash and restart, causing a Denial of Service (DoS). Continued link flaps will create a sustained Denial of Service (DoS) condition.
Affected software
Junos OS
Junos OS Evolved
Junos OS Evolved
How to mitigate CVE-2021-0287
Install updates from vendor's website.
Junos OS - addressed in versions 19.4R1-S4, 19.4R3-S2, 20.1R2-S1, 20.1R3, 20.2R2-S2, 20.2R3, 20.3R2, 20.4R1
Junos OS Evolved - addressed in versions 20.3R2-EVO, 20.4R2-EVO, 21.1R1-EVO
Junos OS Evolved - addressed in versions 20.3R2-EVO, 20.4R2-EVO, 21.1R1-EVO