CVE-2023-36833
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk20th percentile - higher than 20% of all known CVEs
Summary
A Use After Free vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS Evolved allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS). The 'aftman-bt' process crashes after multiple flaps on a multicast-only fast reroute (MoFRR) enabled interface.
Risk Assessment
An attacker can disrupt traffic forwarding on devices, requiring a reboot of the FPC to restore service. This can lead to significant network disruptions.
Recommendation
It is recommended to update Junos OS Evolved to the latest version to mitigate this vulnerability. Monitoring system logs for potential issues is also advised.
Original NVD description (English source)
A Use After Free vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS Evolved on PTX10001-36MR, and PTX10004, PTX10008, PTX10016 with LC1201/1202 allows an adjacent, unauthenticated attacker to cause a Denial of Service (DoS). The process 'aftman-bt' will crash after multiple flaps on a multicast-only fast reroute (MoFRR) enabled interface. This will cause the respective FPC to stop forwarding traffic and it needs to be rebooted to restore the service. An indication that the system experienced this issue is the following log message: <date> <hostname> evo-aftmand-bt[<pid>]: [Error] jexpr_fdb: sanity check failed, ... , app_name L3 Mcast Routes This issue affects Juniper Networks Junos OS Evolved on PTX10001-36MR, PTX10004, PTX10008, PTX10016 with LC1201/1202: 21.2 version 21.2R1-EVO and later versions; 21.3 version 21.3R1-EVO and later versions; 21.4 versions prior to 21.4R3-S3-EVO; 22.1 version 22.1R1-EVO and later versions; 22.2 versions prior to 22.2R3-S2-EVO; 22.3 versions prior to 22.3R3-EVO; 22.4 versions prior to 22.4R1-S2-EVO, 22.4R2-EVO.