What is CVE-2026-103411?

CVE-2026-103411 is a high-severity vulnerability in Juniper Networks Session Smart Router, classified under Integer Underflow. CVSS score: 7.1/10. Published 2026-10-28.

How severe is CVE-2026-103411?

High severity. CVSS v3 base score is 7.1 out of 10.

Integer overflow in Juniper Networks Session Smart Router

CVE-2026-103411

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.

Published 2026-10-28 · last modified 2026-10-28.

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Juniper Networks Session Smart Router

Weakness classification (CWE)

CWE-191 — Integer Underflow

References

supportportal.juniper.net/JSA112183 (vendor-advisory)

Frequently asked questions

What is CVE-2026-103411?: CVE-2026-103411 is a high-severity vulnerability in Juniper Networks Session Smart Router, classified under Integer Underflow. CVSS score: 7.1/10. Published 2026-10-28.
How severe is CVE-2026-103411?: High severity. CVSS v3 base score is 7.1 out of 10.