CVE-2026-57030Network attack vector

Network denial of service via flow timeout race

Published Jul 9, 2026 · Updated Jul 9, 2026

Race condition in the PFE of Juniper Networks Junos OS on SRX Series allows remote attackers to interrupt forwarding or trigger a reboot. During flow removal, concurrent timeout handling can assign more than 10,000 seconds instead of 3 seconds, causing invalidated sessions to accumulate without manual clearance. Exploitation is unauthenticated and network-based, but the triggering timing is outside attacker control; exhaustion stops forwarding or crashes flowd and reboots the device.

CVSS severity8.2
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the PFE of Juniper Networks Junos OS on SRX Series allows remote attackers to interrupt forwarding or trigger a reboot. During flow removal, concurrent timeout handling can assign more than 10,000 seconds instead of 3 seconds, causing invalidated sessions to accumulate without manual clearance. Exploitation is unauthenticated and network-based, but the triggering timing is outside attacker control; exhaustion stops forwarding or crashes flowd and reboots the device.

The record

CVE
CVE-2026-57030
Published
Jul 9, 2026
Updated
Jul 9, 2026
Vendor
Juniper Networks
Product
Junos OS
Classifications
CWE-362, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=24.2 <24.2R2-S3
  2. Affected versionversion=24.4 <24.4R2-S1
  3. Affected versionversion=25.2 <25.2R1-S2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Juniper Networks · Junos OSversion=24.2 <24.2R2-S3; version=24.4 <24.4R2-S1; version=25.2 <25.2R1-S2

Published CVSS scores

8.2Juniper Networks, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L
5.9Juniper Networks, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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