A Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in the Flow-processing Daemon (flowd) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (Dos).
On SRX Series devices when two different threads try to simultaneously process a queue which is used for TCP events flowd will crash. One of these threads can not be triggered externally, so the exploitation of this race condition is outside the attackers direct control.Continued exploitation of this issue will lead to a sustained DoS.
This issue affects Juniper Networks Junos OS:
This issue does not affect Juniper Networks Junos OS versions earlier than 21.2R1.
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was seen during production usage.
This issue has been assigned CVE-2024-21601.
The following software releases have been updated to resolve this specific issue: 21.2R3-S5, 21.3R3-S5, 21.4R3-S4, 22.1R3-S3, 22.2R3-S1, 22.3R2-S2, 22.3R3, 22.4R2-S1, 22.4R3*, 23.2R1, and all subsequent releases. (* pending publication)This issue is being tracked as PR 1728714 which is visible on the Customer Support website.Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).
2024-01-10: Initial Publication