EUVD-2026-42704
GHSA-xc4g-8c26-vcmf
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:X/RE:M/U:X
Network-reachable with no authentication required; limited confidentiality leak and CPU-based availability impact only, no integrity or scope change warranted.
Primary rating from Vendor (juniper).
CVSS VectorVendor: juniper
Lifecycle Timeline
3DescriptionCVE.org
An Improper Restriction of Communication Channel to Intended Endpoints vulnerability in Juniper Networks Junos OS Evolved allows an unauthenticated, network-based attacker to cause a limited information disclosure and availability impact to the device.
Due to a wrong initialization, a process which should only be able to communicate internally within the device can be reached over the network via an open port. This leads to a device being inadvertently exposed and increased CPU cycles spent processing ingress packets.
This issue affects Junos OS Evolved:
- all versions before 23.2R2-S7-EVO,
- 23.4 versions before 23.4R2-S8-EVO,
- 24.2 versions before 24.2R2-S5-EVO,
- 24.4 versions before 24.4R2-S4-EVO,
- 25.2 versions before 25.2R2-S1-EVO,
- 25.4 versions before 25.4R1-S2-EVO.
AnalysisAI
Junos OS Evolved exposes an internal communication process to the network via an unintended open port due to incorrect initialization, enabling unauthenticated remote attackers to interact with a service never designed for external access. Affected Juniper devices suffer limited information disclosure and elevated CPU consumption as the misbound process handles unsolicited ingress packets - a soft availability degradation rather than a crash. No public exploit has been identified at time of analysis and the vulnerability is not listed in CISA KEV, but the unauthenticated network vector across a broad version range warrants prompt patching on internet-facing routing infrastructure.
Technical ContextAI
CWE-923 (Improper Restriction of Communication Channel to Intended Endpoints) describes a socket or IPC binding error where a process intended to communicate only on internal or loopback channels instead binds to an externally reachable network interface. Junos OS Evolved (EVO) is Juniper's next-generation network operating system, architected on a Linux-based microservices model distinct from classic Junos OS. The affected CPE (cpe:2.3:a:juniper_networks:junos_os_evolved:*) spans all version trains. The root cause is a wrong initialization sequence that causes a daemon meant for internal IPC to open a port accessible over the network, violating the intended trust boundary and exposing internal process behavior to untrusted sources.
RemediationAI
Upgrade to a fixed release: 23.2R2-S7-EVO or later, 23.4R2-S8-EVO or later, 24.2R2-S5-EVO or later, 24.4R2-S4-EVO or later, 25.2R2-S1-EVO or later, or 25.4R1-S2-EVO or later, per the Juniper advisory at https://supportportal.juniper.net/JSA110078. As a compensating control where immediate patching is not possible, operators should apply firewall filter (lo0 firewall policy) rules on the affected device to block external access to the exposed port - Juniper's lo0 filters can restrict which source addresses may reach management and internal process ports, reducing exposure without affecting transit traffic. Note that this workaround adds operational complexity and must be maintained across configuration changes. Restricting management plane reachability to trusted management networks via routing-instance segregation (e.g., dedicated out-of-band management VRF) further limits the attack surface.
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Same technique Information Disclosure
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External POC / Exploit Code
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