Juniper Session Smart Router DHCP Decoder Integer Underflow DoS
CVE-2026-103411 Published on October 28, 2026

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.

Vendor Advisory NVD

Vulnerability Analysis

Exploitation:
NONE
Automatable:
NO
Technical Impact:
PARTIAL
Attack Vector:
ADJACENT_NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
LOW
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Type

What is an Integer underflow Vulnerability?

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This can happen in signed and unsigned cases.

CVE-2026-103411 has been classified to as an Integer underflow vulnerability or weakness.


Affected Versions

Juniper Networks Session Smart Router: