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CVE-2026-57030— Junos OS: SRX Series: Flow sessions are not getting cleared leading to a DoS

Quick assessment

Affected

Juniper Networks Junos OS

Exploitation

Public or AI PoC available; prioritize validation

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Juniper Networks Junos OS是美国Juniper Networks公司的一款专为路由器、交换机和防火墙等物理及虚拟设备打造的网络操作系统。 Juniper Networks Junos OS存在竞争条件问题漏洞，该漏洞源于数据包转发引擎中的竞争条件问题，可能导致未经身份验证的网络攻击者造成拒绝服务。以下版本受到影响：24.2版本至24.2R2-S3之前版本、24.4版本至24.4R2-S1之前版本和25.2版本至25.2R1-S2之前版本。

CVSS 5.9 · Medium EPSS 0.38% · P32 Updated Jul 10, 2026

Possible ATT&CK Techniques 2 AI

T1047 · Windows Management Instrumentation T1499 · Endpoint Denial of Service

Affected Version Matrix 4

Vendor	Product	Version Range	Status
Juniper Networks	Junos OS	`24.2< 24.2R2-S3`	affected
		`24.4< 24.4R2-S1`	affected
		`25.2< 25.2R1-S2`	affected
		`< 24.2R1`	unaffected

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I. Basic Information for CVE-2026-57030

Vulnerability Information

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Vulnerability Title

Junos OS: SRX Series: Flow sessions are not getting cleared leading to a DoS

Source: CVE Program / CVE List V5

Vulnerability Description

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;

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

使用共享资源的并发执行不恰当同步问题(竞争条件)

Source: CVE Program / CVE List V5

Vulnerability Title

Juniper Networks Junos OS 竞争条件问题漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Juniper Networks	Junos OS	24.2 ~ 24.2R2-S3	-

II. Public POCs for CVE-2026-57030

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III. Intelligence Information for CVE-2026-57030

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Vendor Advisories for CVE-2026-57030 (1)

🔗 Article Detail Read full article vendor-advisory

https://www.cve.org/CVERecord?id=CVE-2026-57030

Same Patch Batch · Juniper Networks · 2026-07-09 · 22 CVEs total

CVE-2026-57026	7.5 HIGH	Junos OS: MX Series with SPC3, SRX Series: Processing of a specifically malformed SIP invi
CVE-2026-57023	7.5 HIGH	Junos OS: MX with SPC3, SRX Series: A specifically malformed TCP packet causes a flowd cra
CVE-2026-57028	7.3 HIGH	Junos OS Evolved: A port which has been inadvertently exposed can be reached by an attacke
CVE-2026-57032	6.5 MEDIUM	Junos OS: EX Series: Subscribing to an unsupported telemetry sensor path causes fxpc proce
CVE-2026-33800	6.5 MEDIUM	Junos OS: MX Series: In a VC scenario a high rate of micro-BFD session flaps will cause an
CVE-2026-57027	6.5 MEDIUM	Junos OS: EX4100 Series, EX4400: With sFlow configured in a VC scenario multicast traffic
CVE-2026-33801	6.5 MEDIUM	Junos OS and Junos OS Evolved: When a specifically malformed BGP route update is received
CVE-2026-33803	6.5 MEDIUM	Junos OS Evolved: A port which has been inadvertently exposed can be reached by an attacke
CVE-2026-57019	6.5 MEDIUM	Junos OS: MX Series: Specific traffic causes an FPC to reset
CVE-2026-57020	6.5 MEDIUM	Junos OS: QFX10000 Series: IPv6 multicast traffic received on non-IRB interfaces causes a
CVE-2026-57022	5.9 MEDIUM	Junos OS: MX Series with SPC3, SRX Series: Specific packet in response to a TCP connection
CVE-2026-33794	5.9 MEDIUM	Junos OS Evolved: PTX Series: Receipt of repeated ECMP routing updates results in PFE cras
CVE-2026-57054	5.8 MEDIUM	Junos OS: MX Series: Web filtering doesn't block specifically formatted URLs
CVE-2026-33802	5.5 MEDIUM	Junos OS: EX Series: Unauthorized users can execute service-impacting CLI command
CVE-2026-57025	5.5 MEDIUM	Junos OS and Junos OS Evolved: EX Series, QFX Series, MX Series: A specific 'show l2-learn
CVE-2026-57021	5.3 MEDIUM	Junos OS: SRX Series: If VPN compliance-check is configured an attacker can cause http-gk
CVE-2026-57024	5.3 MEDIUM	Junos OS: MX with SPC3, SRX Series: Repeated VPN negotiation failures will eventually caus
CVE-2026-57029	5.3 MEDIUM	Junos OS Evolved: QFX Series: When sFlow collector reachability changes evo-pfemand proces
CVE-2026-57031	4.7 MEDIUM	Junos OS: MX Series: For subscribers configured on static interfaces, input filters are no
CVE-2026-21901	4.4 MEDIUM	Junos OS and Junos OS Evolved: Configuration of a specific SSH option results in mgd crash

Showing top 20 of 22 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Junos OS

Same vendor: Juniper Networks

Same weakness: CWE-362