Buffer overflow in Juniper Networks Junos OS

CVE-2026-103993

An Out-of-bounds Write vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent attacker which sends a specific set of BGP communities to cause a Denial-of-Service (DoS) as rpd crashes when graceful-shutdown sender community is added when attempting to advertise.

Vulnerability class: Buffer Overflow

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/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

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-103993?
CVE-2026-103993 is a medium-severity vulnerability in Juniper Networks Junos OS, classified under Out-of-bounds Write. CVSS score: 6.8/10. Published 2026-10-14.
How severe is CVE-2026-103993?
Medium severity. CVSS v3 base score is 6.8 out of 10.