CVE-2026-103391— Session Smart Router: An attacker-controlled TCP option causes an out-of-bounds write when using the TCP proxy feature
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.
Juniper Networks Session Smart Router（SSR）的 TCP 代理/优化路径中存在一个越界写入漏洞。攻击者可通过携带伪造 TCP 选项长度的中转 TCP 数据包，破坏转发的数据包内容，并可能导致数据平面崩溃。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 3
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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-2026-103391
Vulnerability Information
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Vulnerability Title
Session Smart Router: An attacker-controlled TCP option causes an out-of-bounds write when using the TCP proxy feature
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Juniper Networks | Session Smart Router | 0 ~ 7.0.5 | - |
|
II. Public POCs for CVE-2026-103391
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Pages for CVE-2026-103391 (1)
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🔗 Article Detail vendor-advisory
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-2026-103401 | 8.8 HIGH | Session Smart Router and Session Smart Conductor: An attacker can overwrite arbitrary file |
| 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-2026-103402 | 8.8 HIGH | Session Smart Router and Session Smart Conductor: Lack of integrity verification in cache |
| 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-2026-103390 | 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 |
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