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CVE-2026-103411

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

Juniper Networks Session Smart RouterNetwork & edge
Open in ThreatlineRecord JSON
CVSS
7.1High
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed in7.0.5Also 7.1.7, 7.2.3CVE List
Published28 Oct 2026Updated 28 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

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.

Text from CVE List

Affected versions 3

  • Session Smart Routeraffected: all versions before 7.0.5CVE List
  • Session Smart Routeraffected: 7.1.0 before 7.1.7CVE List
  • Session Smart Routeraffected: 7.2.0 before 7.2.3CVE List

References 1