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CVE-2026-57027— Junos OS: EX4100 Series, EX4400: With sFlow configured in a VC scenario multicast traffic leads to an FPC crash

CVSS 6.5 · Medium EPSS 0.17% · P6

Affected Version Matrix 4

VendorProductVersion RangeStatus
Juniper NetworksJunos OS< 23.2R2-S7affected
23.4< 23.4R2-S7affected
24.2< 24.2R2-S4affected
24.4< 24.4R2affected
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I. Basic Information for CVE-2026-57027

Vulnerability Information
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Vulnerability Title
Junos OS: EX4100 Series, EX4400: With sFlow configured in a VC scenario multicast traffic leads to an FPC crash
Source: CVE Program / CVE List V5
Vulnerability Description
A Missing Release of Memory after Effective Lifetime vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on specific EX Series devices allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS).When sFlow is configured in a Virtual Chassis (VC) scenario with EX4100 Series or EX4400 Series devices, multicast traffic which is received on one VC member and sent out on another member leads to a memory leak and ultimately an FPC crash and restart. The leak can be monitored by watching the continuous increase of the buffer values in the output of: user@host> show chassis fpc This issue affects Junos OS on EX4100 Series and EX4400: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S7, * 24.2 versions before 24.2R2-S4, * 24.4 versions before 24.4R2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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存在资源管理错误漏洞，该漏洞源于数据包转发引擎（pfe）缺少有效内存释放，可能导致未经验证的相邻攻击者造成拒绝服务。以下版本受到影响：23.2R2-S7之前版本、23.4R2-S7之前的23.4版本、24.2R2-S4之前的24.2版本和24.4R2之前的24.4版本。
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

VendorProductAffected VersionsCPESubscribe
Juniper NetworksJunos OS 0 ~ 23.2R2-S7 -

II. Public POCs for CVE-2026-57027

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III. Intelligence Information for CVE-2026-57027

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Vendor Advisories for CVE-2026-57027 (1)

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

CVE-2026-570267.5 HIGHJunos OS: MX Series with SPC3, SRX Series: Processing of a specifically malformed SIP invi
CVE-2026-570237.5 HIGHJunos OS: MX with SPC3, SRX Series: A specifically malformed TCP packet causes a flowd cra
CVE-2026-570287.3 HIGHJunos OS Evolved: A port which has been inadvertently exposed can be reached by an attacke
CVE-2026-570326.5 MEDIUMJunos OS: EX Series: Subscribing to an unsupported telemetry sensor path causes fxpc proce
CVE-2026-338006.5 MEDIUMJunos OS: MX Series: In a VC scenario a high rate of micro-BFD session flaps will cause an
CVE-2026-338016.5 MEDIUMJunos OS and Junos OS Evolved: When a specifically malformed BGP route update is received
CVE-2026-338036.5 MEDIUMJunos OS Evolved: A port which has been inadvertently exposed can be reached by an attacke
CVE-2026-570196.5 MEDIUMJunos OS: MX Series: Specific traffic causes an FPC to reset
CVE-2026-570206.5 MEDIUMJunos OS: QFX10000 Series: IPv6 multicast traffic received on non-IRB interfaces causes a
CVE-2026-570225.9 MEDIUMJunos OS: MX Series with SPC3, SRX Series: Specific packet in response to a TCP connection
CVE-2026-337945.9 MEDIUMJunos OS Evolved: PTX Series: Receipt of repeated ECMP routing updates results in PFE cras
CVE-2026-570305.9 MEDIUMJunos OS: SRX Series: Flow sessions are not getting cleared leading to a DoS
CVE-2026-570545.8 MEDIUMJunos OS: MX Series: Web filtering doesn't block specifically formatted URLs
CVE-2026-570255.5 MEDIUMJunos OS and Junos OS Evolved: EX Series, QFX Series, MX Series: A specific 'show l2-learn
CVE-2026-338025.5 MEDIUMJunos OS: EX Series: Unauthorized users can execute service-impacting CLI command
CVE-2026-570215.3 MEDIUMJunos OS: SRX Series: If VPN compliance-check is configured an attacker can cause http-gk
CVE-2026-570245.3 MEDIUMJunos OS: MX with SPC3, SRX Series: Repeated VPN negotiation failures will eventually caus
CVE-2026-570295.3 MEDIUMJunos OS Evolved: QFX Series: When sFlow collector reachability changes evo-pfemand proces
CVE-2026-570314.7 MEDIUMJunos OS: MX Series: For subscribers configured on static interfaces, input filters are no
CVE-2026-219014.4 MEDIUMJunos 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 &rarr; →

IV. Related Vulnerabilities

Same product: Junos OS
Same vendor: Juniper Networks
Same weakness: CWE-401

V. Comments for CVE-2026-57027

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