CVE-2026-57027— Junos OS: EX4100 Series, EX4400: With sFlow configured in a VC scenario multicast traffic leads to an FPC crash
Quick assessment
Affected
Juniper Networks Junos OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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。
Possible ATT&CK Techniques 2 AI
T1068 · Exploitation for Privilege Escalation T1499 · Endpoint Denial of ServiceAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Juniper Networks | Junos OS | < 23.2R2-S7 |
affected |
23.4< 23.4R2-S7 |
affected | ||
24.2< 24.2R2-S4 |
affected | ||
24.4< 24.4R2 |
affected |
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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
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Juniper Networks | Junos OS | 0 ~ 23.2R2-S7 | - |
|
II. Public POCs for CVE-2026-57027
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-57027 (1)
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-2026-33801 | 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-2026-57030 | 5.9 MEDIUM | Junos OS: SRX Series: Flow sessions are not getting cleared leading to a DoS |
| CVE-2026-57054 | 5.8 MEDIUM | Junos OS: MX Series: Web filtering doesn't block specifically formatted URLs |
| CVE-2026-57025 | 5.5 MEDIUM | Junos OS and Junos OS Evolved: EX Series, QFX Series, MX Series: A specific 'show l2-learn |
| CVE-2026-33802 | 5.5 MEDIUM | Junos OS: EX Series: Unauthorized users can execute service-impacting CLI command |
| 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
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