PT-2021-3643 · Juniper Networks · Junos Evolved+1
Published
2021-07-14
·
Updated
2021-10-25
·
CVE-2021-0287
CVSS v3.1
6.5
Medium
| Vector | AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Juniper Networks Junos OS versions 19.4 through 19.4R1-S4, 19.4R3-S2; 20.1 versions prior to 20.1R2-S1, 20.1R3; 20.2 versions prior to 20.2R2-S2, 20.2R3; 20.3 versions prior to 20.3R2
Juniper Networks Junos OS Evolved versions 20.3-EVO prior to 20.3R2-EVO; 20.4-EVO versions prior to 20.4R2-EVO
Description
In a 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.
Recommendations
For Juniper Networks Junos OS versions 19.4 through 19.4R1-S4, 19.4R3-S2, update to version 19.4R1-S4 or later.
For Juniper Networks Junos OS versions 20.1 prior to 20.1R2-S1, 20.1R3, update to version 20.1R2-S1 or later.
For Juniper Networks Junos OS versions 20.2 prior to 20.2R2-S2, 20.2R3, update to version 20.2R2-S2 or later.
For Juniper Networks Junos OS versions 20.3 prior to 20.3R2, update to version 20.3R2 or later.
For Juniper Networks Junos OS Evolved versions 20.3-EVO prior to 20.3R2-EVO, update to version 20.3R2-EVO or later.
For Juniper Networks Junos OS Evolved versions 20.4-EVO prior to 20.4R2-EVO, update to version 20.4R2-EVO or later.
As a temporary workaround, consider disabling the ISIS Flexible Algorithm for Segment Routing and sensor-based statistics until a patch is available.
Fix
DoS
Improper Check for Exceptional Conditions
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Weakness Enumeration
Related Identifiers
Affected Products
Junos
Junos Evolved