A Use After Free 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).



When web filtering for TCP traffic is configured, a high volume of DNS requests increases the likelihood of a flowd crash and restart, which leads to a complete service outage until the service has automatically recovered. This is a race condition outside the attacker's direct control.

This issue affects Junos OS on SRX Series:


* All versions before 23.2R2-S5;
* from 23.4 before 23.4R2-S6;
* from 24.2 before 24.2R2-S3;
* from 24.4 before 24.4R2-S1;
* from 25.2 before 25.2R1-S1, 25.2R2.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact Low

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Juniper Networks Junos OS unaffected
Version Status Constraints
0 affected < 23.2R2-S5
23.4 affected < 23.4R2-S6
24.2 affected < 24.2R2-S3
24.4 affected < 24.4R2-S1
25.2 affected < 25.2R1-S1, 25.2R2

No data.

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

The following software releases have been updated to resolve this specific issue: Junos OS: 23.2R2-S5, 23.4R2-S6, 24.2R2-S3, 24.4R2-S1, 25.2R1-S1, 25.2R2, 25.4R1, and all subsequent releases.

Workaround

There are no known workarounds for this issue.

References
Link Providers
https://supportportal.juniper.net/JSA112181 cve-icon cve-icon
History

Wed, 14 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
Description A Use After Free 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). When web filtering for TCP traffic is configured, a high volume of DNS requests increases the likelihood of a flowd crash and restart, which leads to a complete service outage until the service has automatically recovered. This is a race condition outside the attacker's direct control. This issue affects Junos OS on SRX Series: * All versions before 23.2R2-S5; * from 23.4 before 23.4R2-S6; * from 24.2 before 24.2R2-S3; * from 24.4 before 24.4R2-S1; * from 25.2 before 25.2R1-S1, 25.2R2.
Title Junos OS: SRX Series: A high volume of DNS traffic over TCP can lead to a flowd crash
Weaknesses CWE-416
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.2, 'vector': '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/AU:Y/RE:M'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: juniper

Published:

Updated: 2026-10-14T20:26:05.668Z

Reserved: 2026-09-28T17:37:38.548Z

Link: CVE-2026-102078

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-14T17:18:03.400

Modified: 2026-10-14T21:17:32.260

Link: CVE-2026-102078

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-14T23:00:12Z

Weaknesses