A Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
As part of the stateful traffic processing on SRX Series devices flows are being established, and removed when not needed anymore. During the removal process the timeout of a flow should be set to 3 seconds and consequentially the flow should be removed shortly after. Due to a race condition occurring when setting the timeout there is a chance (the exact conditions are outside the attackers control) that the timeout is instead set to a very high value of larger than 10,000 seconds:
user@host> show security flow session | match timeout
Session ID: 98784248524, Policy name: PROD-FLOW/4, HA State: Active, Timeout: 85250, Session State: Valid
This will lead to an accumulation of flows which can be observed by an ever-increasing value of invalidated sessions in the output of 'show security flow session summary':
user@host> show security flow session summary | match invalid
Invalidated sessions: 216931These sessions can't be cleared manually with the 'clear security flow session' command, which will either lead to forwarding to stop (and the system needs to be manually recovered with a reboot) or to a flowd core and automatic reboot.
This issue affects Junos OS on SRX Series:
* 24.2 versions before 24.2R2-S3,
* 24.4 versions before 24.4R2-S1, 24.4R2-S2,
* 25.2 versions before 25.2R1-S2, 25.2R2.
This issue does not affect releases earlier than 24.2R1;
References
| Link | Resource |
|---|---|
| https://supportportal.juniper.net/JSA110090 | Vendor Advisory |
Configurations
Configuration 1 (hide)
| AND |
|
History
No history.
Information
Published : 2026-07-09 22:17
Updated : 2026-07-13 20:16
NVD link : CVE-2026-57030
Mitre link : CVE-2026-57030
CVE.ORG link : CVE-2026-57030
JSON object : View
Products Affected
juniper
- srx4120
- srx320
- srx4200
- srx5800
- srx4700
- srx345
- srx440
- srx340
- srx1500
- srx2300
- srx4600
- srx400
- srx300
- srx5400
- srx4100
- srx1600
- srx380
- srx4300
- srx5600
- junos
CWE
CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')