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
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
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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special attacker-side conditions are required: the vulnerability is exploitable by any unauthenticated host with network reachability to the device, including across the management plane or data-plane interfaces where the process is inadvertently exposed. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L yields a 6.5 (Medium), and the signal breakdown is internally consistent: the flaw is trivially reachable from any network segment without authentication, but the blast radius is deliberately bounded - partial confidentiality exposure and partial availability impact (CPU pressure from ingress packet processing), with no integrity impact and no scope change. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker reachable over the network sends packets to the unintended open port on a vulnerable Junos OS Evolved device. The internal process - incorrectly bound to a network-accessible interface - accepts and processes these packets, leaking limited internal state and consuming elevated CPU cycles; a sustained flood can degrade the device's packet processing capacity. … |
| Remediation | 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. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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