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CVE-2026-57054— Junos OS: MX Series: Web filtering doesn't block specifically formatted URLs

CVSS 5.8 · Medium EPSS 0.23% · P14

Possible ATT&CK Techniques 1AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 6

VendorProductVersion RangeStatus
Juniper NetworksJunos OS< 23.2R2-S7affected
23.4< 23.4R2-S8affected
24.2< 24.2R2-S5affected
24.4< 24.4R2-S4affected
25.2< 25.2R2-S1affected
25.4< 25.4R1-S2, 25.4R2affected
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I. Basic Information for CVE-2026-57054

Vulnerability Information
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Vulnerability Title
Junos OS: MX Series: Web filtering doesn't block specifically formatted URLs
Source: CVE Program / CVE List V5
Vulnerability Description
A Use of Incorrectly-Resolved Name or Reference vulnerability in the URL filtering plugin of Juniper Networks Junos OS on MX Series allows an unauthenticated, network-based attacker to bypass web filtering and access downstream resources that should be unreachable. If an MX Series device is configured with web filtering, and an attacker sends a request with a specifically formatted URL, this request will get forwarded despite the system being configured to block it. In turn, an attacker can access downstream resources that are expected to be unreachable. This issue affects Junos OS on MX Series: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S8, * 24.2 versions before 24.2R2-S5, * 24.4 versions before 24.4R2-S4, * 25.2 versions before 25.2R2-S1, * 25.4 versions before 25.4R1-S2, 25.4R2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不正确的解析名称或索引
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos OS 输入验证错误漏洞
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存在输入验证错误漏洞，该漏洞源于URL filtering plugin中存在不正确解析的名称或引用，可能导致未经身份验证的网络攻击者绕过web过滤并访问下游资源。以下版本受到影响：23.2R2-S7之前版本、23.4R2-S8之前的23.4版本、24.2R2-S5之前的24.2版本、24.4R2
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-2026-57054

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III. Intelligence Information for CVE-2026-57054

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Vendor Advisories for CVE-2026-57054 (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-2026-570276.5 MEDIUMJunos OS: EX4100 Series, EX4400: With sFlow configured in a VC scenario multicast traffic
CVE-2026-570225.9 MEDIUMJunos OS: MX Series with SPC3, SRX Series: Specific packet in response to a TCP connection
CVE-2026-570305.9 MEDIUMJunos OS: SRX Series: Flow sessions are not getting cleared leading to a DoS
CVE-2026-337945.9 MEDIUMJunos OS Evolved: PTX Series: Receipt of repeated ECMP routing updates results in PFE cras
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-2026-570245.3 MEDIUMJunos OS: MX with SPC3, SRX Series: Repeated VPN negotiation failures will eventually caus
CVE-2026-570215.3 MEDIUMJunos OS: SRX Series: If VPN compliance-check is configured an attacker can cause http-gk
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-706

V. Comments for CVE-2026-57054

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