What is CVE-2026-33789?

CVE-2026-33789 is a critical-severity vulnerability in Juniper Networks Junos OS, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-10-14.

How severe is CVE-2026-33789?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Juniper Networks Junos OS

CVE-2026-33789

A Stack-based Buffer Overflow vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated BGP peer to cause a denial of service and potential root-level command execution via crafted BGP route updates when the BGP Monitoring Protocol (BMP) is enabled.

Vulnerability class: Buffer Overflow

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

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-121 — Stack-based Buffer Overflow

References

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

Frequently asked questions

What is CVE-2026-33789?: CVE-2026-33789 is a critical-severity vulnerability in Juniper Networks Junos OS, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-10-14.
How severe is CVE-2026-33789?: Critical severity. CVSS v3 base score is 9.8 out of 10.