CVE-2026-57030
Severity CVSS v4.0:
HIGH
Type:
CWE-362
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
Publication date:
09/07/2026
Last modified:
13/07/2026
Description
A Concurrent Execution using Shared Resource with Improper Synchronization (&#39;Race Condition&#39;) 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).<br />
<br />
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:<br />
<br />
<br />
<br />
user@host> show security flow session | match timeout<br />
Session ID: 98784248524, Policy name: PROD-FLOW/4, HA State: Active, Timeout: 85250, Session State: Valid<br />
<br />
This will lead to an accumulation of flows which can be observed by an ever-increasing value of invalidated sessions in the output of &#39;show security flow session summary&#39;:<br />
<br />
user@host> show security flow session summary | match invalid<br />
Invalidated sessions: 216931These sessions can&#39;t be cleared manually with the &#39;clear security flow session&#39; 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.<br />
<br />
<br />
This issue affects Junos OS on SRX Series:<br />
<br />
<br />
* 24.2 versions before 24.2R2-S3,<br />
* 24.4 versions before 24.4R2-S1, 24.4R2-S2,<br />
* 25.2 versions before 25.2R1-S2, 25.2R2.<br />
<br />
<br />
<br />
<br />
This issue does not affect releases earlier than 24.2R1;
Impact
Base Score 4.0
8.20
Severity 4.0
HIGH
Base Score 3.x
5.90
Severity 3.x
MEDIUM
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:o:juniper:junos:24.2:-:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:24.2:r1:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:24.2:r1-s1:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:24.2:r1-s2:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:24.2:r2:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:24.2:r2-s1:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:24.2:r2-s2:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:24.4:-:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:24.4:r1:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:24.4:r1-s2:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:24.4:r1-s3:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:24.4:r2:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:25.2:-:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:25.2:r1:*:*:*:*:*:* | ||
| cpe:2.3:o:juniper:junos:25.2:r1-s1:*:*:*:*:*:* |
To consult the complete list of CPE names with products and versions, see this page