What is CVE-2026-33780?

CVE-2026-33780 is a medium-severity vulnerability in Juniper Networks Junos Os, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.5/10. Published 2026-04-09.

How severe is CVE-2026-33780?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Juniper Networks Junos Os

CVE-2026-33780

A Missing Release of Memory after Effective Lifetime vulnerability in the Layer 2 Address Learning Daemon (l2ald) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause a memory leak ultimat…

EPSS: 0.000 (6.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Juniper Networks Junos Os — versions 0, 23.2, 23.4
Juniper Networks Junos Os Evolved — versions all version prior to, 23.2, 23.4

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

kb.juniper.net/JSA107819 (vendor-advisory)

Frequently asked questions

What is CVE-2026-33780?: CVE-2026-33780 is a medium-severity vulnerability in Juniper Networks Junos Os, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.5/10. Published 2026-04-09.
How severe is CVE-2026-33780?: Medium severity. CVSS v3 base score is 6.5 out of 10.