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CVE-2026-103401— Session Smart Router and Session Smart Conductor: An attacker can overwrite arbitrary files as root

Quick assessment

Affected
Juniper Networks Session Smart Router
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.

在 Juniper Networks Session Smart Router 和 Session Smart Conductor 的未认证 Web 服务器处理程序中存在一个“文件访问前的链接解析不当”（即“链接跟随”）漏洞。该漏洞允许本地非特权用户通过未认证的 API 端点，以 root 权限覆盖任意文件。 该漏洞可在由 Mist 管理的路由器上，以及尚未接入 Conductor 的未管理路由器上被利用。而已由 Conductor 管理的路由器不受此漏洞影响。

CVSS 8.8 · High EPSS 0.34% · P28

Affected Version Matrix 6

VendorProduct Version RangeStatus
Juniper Networks Session Smart Conductor < 7.0.5 affected
7.1.0< 7.1.7 affected
7.2.0< 7.2.3 affected
Juniper Networks Session Smart Router < 7.0.5 affected
7.1.0< 7.1.7 affected
7.2.0< 7.2.3 affected
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I. Basic Information for CVE-2026-103401

Vulnerability Information
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Vulnerability Title
Session Smart Router and Session Smart Conductor: An attacker can overwrite arbitrary files as root
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Juniper Networks Session Smart Router 0 ~ 7.0.5 -
Juniper Networks Session Smart Conductor 0 ~ 7.0.5 -

II. Public POCs for CVE-2026-103401

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III. Intelligence Information for CVE-2026-103401

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Vendor Pages for CVE-2026-103401 (1)

Same Patch Batch · Juniper Networks · 2026-10-28 · 18 CVEs total

CVE-2026-103409 9.8 CRITICAL Session Smart Router: An attacker obtains administrative privileges when an unauthenticate
CVE-2026-103406 9.8 CRITICAL Session Smart Conductor: An unauthenticated attacker causes arbitrary command execution du
CVE-2026-103408 8.8 HIGH Session Smart Router: An attacker-controlled input causes remote code execution when parsi
CVE-2026-103407 8.8 HIGH Session Smart Router and Session Smart Conductor: Unsanitized input allows arbitrary file
CVE-2026-103402 8.8 HIGH Session Smart Router and Session Smart Conductor: Lack of integrity verification in cache
CVE-2026-106079 8.8 HIGH Session Smart Router and Session Smart Conductor: Improper validation of a field causes pr
CVE-2026-103403 8.8 HIGH Session Smart Router and Session Smart Conductor: Unvalidated input causes arbitrary file
CVE-2026-103410 7.5 HIGH Session Smart Router: Integer overflow causes denial of service during TLS certificate ins
CVE-2026-103411 7.1 HIGH Session Smart Router: A malicious DHCP server causes information disclosure and a service
CVE-2026-103404 6.8 MEDIUM Session Smart Conductor: Insecure file permissions cause unauthorized access to sensitive
CVE-2026-103405 5.8 MEDIUM Session Smart Router and Session Smart Conductor: Unsanitized input causes HTTP response s
CVE-2026-103400 5.5 MEDIUM Session Smart Router and Session Smart Conductor: Crafted directory names cause arbitrary
CVE-2026-103391 5.3 MEDIUM Session Smart Router: An attacker-controlled TCP option causes an out-of-bounds write when
CVE-2026-103390 5.3 MEDIUM Session Smart Router and Session Smart Conductor: A malformed HTTP URI causes a service cr
CVE-2026-103392 4.8 MEDIUM Session Smart Router: A SACK option causes out-of-bounds memory access and TCP payload cor
CVE-2026-103393 4.3 MEDIUM Session Smart Router: An attacker can cause an out-of-bounds read during VRRP packet proce
CVE-2026-103394 3.7 LOW Session Smart Router: An incomplete operator causes the use of incorrect encryption keys d

IV. Related Vulnerabilities

Same product: Session Smart Router
Same vendor: Juniper Networks
Same weakness: CWE-59