CVE-2026-57025— Junos OS and Junos OS Evolved: EX Series, QFX Series, MX Series: A specific 'show l2-learning/ethernet-switching' command causes l2ald 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存在缓冲区错误漏洞，该漏洞源于fileio库存在指针值返回超出预期范围的问题，可能导致本地低权限攻击者造成拒绝服务。以下版本受到影响： Juniper Networks Junos OS：23.2R2-S7之前版本、23.4版本且23.4R2-S7之前版本、24.2版本且24.2R2之前版本、24
Affected Version Matrix 8
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Juniper Networks | Junos OS | < 23.2R2-S7 |
affected |
23.4< 23.4R2-S7 |
affected | ||
24.2< 24.2R2 |
affected | ||
24.4< 24.4R1-S2 |
affected | ||
| Juniper Networks | Junos OS Evolved | < 23.2R2-S7-EVO |
affected |
23.4< 23.4R2-S8-EVO |
affected | ||
24.2< 24.2R2-EVO |
affected | ||
24.4< 24.4R1-S3-EVO |
affected |
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I. Basic Information for CVE-2026-57025
Vulnerability Information
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Vulnerability Title
Junos OS and Junos OS Evolved: EX Series, QFX Series, MX Series: A specific 'show l2-learning/ethernet-switching' command causes l2ald crash
Source: CVE Program / CVE List V5
Vulnerability Description
A Return of Pointer Value Outside of Expected Range vulnerability in the fileio library of Juniper Networks Junos OS and Junos OS Evolved allows a local, low-privilged attacker to cause a Denial-of-Service (DoS).
On EX Series, QFX Series and MX Series a low-privileged attacker issuing a specific 'show l2-learning' or 'show ethernet-switching' command will cause an l2ald crash which will lead to a temporary service impact for all layer 2 services until the process has automatically restarted.
This issue affects EX Series, QFX Series, MX Series:
Junos OS:
* all versions before 23.2R2-S7,
* 23.4 versions before 23.4R2-S7,
* 24.2 versions before 24.2R2,
* 24.4 versions before 24.4R1-S2.
Junos OS Evolved:
* all versions before 23.2R2-S7-EVO,
* 23.4 versions before 23.4R2-S8-EVO,
* 24.2 versions before 24.2R2-EVO,
* 24.4 versions before 24.4R1-S3-EVO.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在预期范围外返回指针值
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS 缓冲区错误漏洞
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存在缓冲区错误漏洞，该漏洞源于fileio库存在指针值返回超出预期范围的问题，可能导致本地低权限攻击者造成拒绝服务。以下版本受到影响： Juniper Networks Junos OS：23.2R2-S7之前版本、23.4版本且23.4R2-S7之前版本、24.2版本且24.2R2之前版本、24
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 | - |
|
| Juniper Networks | Junos OS Evolved | 0 ~ 23.2R2-S7-EVO | - |
|
II. Public POCs for CVE-2026-57025
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-57025 (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-2026-57027 | 6.5 MEDIUM | Junos OS: EX4100 Series, EX4400: With sFlow configured in a VC scenario multicast traffic |
| 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-2026-33802 | 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 → →
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V. Comments for CVE-2026-57025
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