CVE-2026-103407

Session Smart Router and Session Smart Conductor: Unsanitized input allows arbitrary file read, overwrite, or deletion via the PKI management

An Improper Limitation of a Pathname to a Restricted Directory vulnerability in ConfigDirector in Juniper Networks Session Smart Router and Session Smart Conductor allows an authenticated REST user to read, overwrite, or delete arbitrary certificate and key files on the host filesystem via the certificate and private-key REST API.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Conductor Session Smart Router

CVE-2026-103409

Session Smart Router: An attacker obtains administrative privileges when an unauthenticated internal endpoint is accessed

A Missing authentication for critical function vulnerability in Juniper Networks Session Smart Router allows an unauthenticated network-based attacker to obtain administrative privileges by passing crafted URL parameters to an insecure endpoint running as root. Note that this vulnerability can only be exploited prior to the device being onboarded to Mist/Conductor. The issue can no longer be exploited once a device is onboarded to Mist/Conductor.

CVSS 3.1 · 9.8 Critical EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Router

CVE-2026-103408

Session Smart Router: An attacker-controlled input causes remote code execution when parsing DHCP options

A Stack Buffer Overflow vulnerability in the DHCP client in Juniper Networks Session Smart Router allows an unauthenticated attacker on the local network to achieve remote code execution via a malicious DHCP reply.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Router

CVE-2026-103405

Session Smart Router and Session Smart Conductor: Unsanitized input causes HTTP response splitting

An Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the web server in Juniper Networks Session Smart Router and Session Smart Conductor allows an attacker to inject arbitrary HTTP headers via unsanitized request body parameters.

CVSS 3.1 · 5.8 Medium EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Conductor Session Smart Router

CVE-2026-103403

Session Smart Router and Session Smart Conductor: Unvalidated input causes arbitrary file deletion and command execution when deleting audit rules

An Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in AccessManager in Juniper Networks Session Smart Router and Session Smart Conductor allows an attacker to perform arbitrary file deletion and arbitrary command execution via the deletion of an audit rule.

CVSS 3.1 · 8.8 High EPSS 1.2% KEV · Not listed

Vendors

Juniper

Products

Session Smart Conductor Session Smart Router

CVE-2026-103402

Session Smart Router and Session Smart Conductor: Lack of integrity verification in cache files causes arbitrary code execution and privilege escalation

An Insufficient Verification of Data Authenticity vulnerability in PCLI in Juniper Networks Session Smart Router and Session Smart Conductor allows an attacker with write access to the model cache directory to execute arbitrary code and escalate privileges via the processing of unverified cache files.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Conductor Session Smart Router

CVE-2026-103401

Session Smart Router and Session Smart Conductor: An attacker can overwrite arbitrary files as root

An Improper Link Resolution Before File Access ('Link Following') vulnerability in the unauthenticated web server handlers in Juniper Networks Session Smart Router and Session Smart Conductor allows a local unprivileged user to overwrite arbitrary files as root via unauthenticated API endpoints. This vulnerability can be exploited on Mist-managed routers and on unmanaged Routers that have not yet been onboarded to a Conductor. Routers already managed by Conductor are not affected.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Conductor Session Smart Router

CVE-2026-103391

Session Smart Router: An attacker-controlled TCP option causes an out-of-bounds write when using the TCP proxy feature

An Out-of-bounds Write vulnerability in the SSR TCP proxy/optimization path in Juniper Networks Session Smart Router allows an attacker to corrupt forwarded packet data and potentially cause a data-plane crash via a transit TCP packet with a crafted TCP option length.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Router

CVE-2026-106079

Session Smart Router and Session Smart Conductor: Improper validation of a field causes privilege escalation when updating the YANG configuration

An Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') vulnerability in AccessManager in Juniper Networks Session Smart Router and Session Smart Conductor allows an attacker with config-write privileges to achieve arbitrary command execution as root in the YANG configuration.

CVSS 3.1 · 8.8 High EPSS 1.2% KEV · Not listed

Vendors

Juniper

Products

Session Smart Conductor Session Smart Router

CVE-2026-103411

Session Smart Router: A malicious DHCP server causes information disclosure and a service crash during DHCP option parsing

An Integer Underflow vulnerability in DhcpMessageDecoder in Juniper Networks Session Smart Router allows an attacker with local network access to cause information disclosure and a denial of service via a malicious DHCP reply.

CVSS 3.1 · 7.1 High EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Router

CVE-2026-103393

Session Smart Router: An attacker can cause an out-of-bounds read during VRRP packet processing

An Out-of-Bounds Read vulnerability in the VRRP implementation in Juniper Networks Session Smart Router allows an L2-adjacent attacker to read stale memory contents or cause a system fault via a specially crafted VRRPv3 advertisement.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Router

CVE-2026-103392

Session Smart Router: A SACK option causes out-of-bounds memory access and TCP payload corruption when TCP sequence stitching is enabled

An Out-of-Bounds Write vulnerability in the TCP header processing in Juniper Networks Session Smart Router allows an attacker to corrupt TCP payload data and potentially cause session desynchronization via a transit TCP packet with an oversized SACK option length.

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Router

CVE-2026-103410

Session Smart Router: Integer overflow causes denial of service during TLS certificate inspection

An Integer Overflow vulnerability in the DPI certificate scanner in Juniper Networks Session Smart Router allows an unauthenticated remote attacker to cause a denial of service via a specially crafted TLS server certificate.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Router

CVE-2026-103400

Session Smart Router and Session Smart Conductor: Crafted directory names cause arbitrary filesystem unmounting during service cleanup

An Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in the ember service in Juniper Networks Session Smart Router and Session Smart Conductor allows an attacker with local access to unmount arbitrary filesystems or cause a denial of service via the creation of specially named directories and a service restart.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Conductor Session Smart Router

CVE-2026-103394

Session Smart Router: An incomplete operator causes the use of incorrect encryption keys during security policy updates.

An Improper Initialization vulnerability in the SSR software in Juniper Networks Session Smart Router allows an attacker to decrypt traffic or cause a denial of service via security policy assignment.

CVSS 3.1 · 3.7 Low EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Router

CVE-2026-103390

Session Smart Router and Session Smart Conductor: A malformed HTTP URI causes a service crash during HTTP application identification

An Out-of-Bounds Read vulnerability in the HttpParser component in Juniper Networks Session Smart Router and Session Smart Conductor allows an attacker to cause a denial of service via a specially crafted HTTP request.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Juniper

Products

Session Smart Conductor Session Smart Router

CVE-2025-21589

Session Smart Router, Session Smart Conductor, WAN Assurance Router: API Authentication Bypass vulnerability

An Authentication Bypass Using an Alternate Path or Channel vulnerability in Juniper Networks Session Smart Router may allows a network-based attacker to bypass authentication and take administrative control of the device. This issue affects Session Smart Router:  * from 5.6.7 before 5.6.17,  * from 6.0 before 6.0.8 (affected from 6.0.8), * from 6.1 before 6.1.12-lts,  * from 6.2 before 6.2.8-lts,  * from 6.3 before 6.3.3-r2;  This issue affects Session Smart Conductor:  * from 5.6.7 before 5.6.17,  * from 6.0 before 6.0.8 (affected from 6.0.8), * from 6.1 before 6.1.12-lts,  * from 6.2 before 6.2.8-lts,  * from 6.3 before 6.3.3-r2;  This issue affects WAN Assurance Managed Routers:  * from 5.6.7 before 5.6.17,  * from 6.0 before 6.0.8 (affected from 6.0.8), * from 6.1 before 6.1.12-lts,  * from 6.2 before 6.2.8-lts,  * from 6.3 before 6.3.3-r2.

CVSS 4.0 · 9.3 Critical EPSS 1.5% KEV · Not listed

Vendors

Juniper

Products

Session Smart Conductor Session Smart Router Wan Assurance Managed Router