What is CVE-2026-102177?

CVE-2026-102177 is a high-severity vulnerability in Juniper Networks Junos OS, classified under Out-of-bounds Write. CVSS score: 7.6/10. Published 2026-10-14.

How severe is CVE-2026-102177?

High severity. CVSS v3 base score is 7.6 out of 10.

Buffer overflow in Juniper Networks Junos OS

CVE-2026-102177

An Out-of-bounds Write vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause a denial of service when IS-IS link protection and backup-selection are configured.

Vulnerability class: Buffer Overflow

Published 2026-10-14 · last modified 2026-10-14.

CVSS v3 metric

CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/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 Junos OS
Juniper Networks Junos OS Evolved — versions 23.4X100

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

supportportal.juniper.net/JSA112187 (vendor-advisory)

Frequently asked questions

What is CVE-2026-102177?: CVE-2026-102177 is a high-severity vulnerability in Juniper Networks Junos OS, classified under Out-of-bounds Write. CVSS score: 7.6/10. Published 2026-10-14.
How severe is CVE-2026-102177?: High severity. CVSS v3 base score is 7.6 out of 10.