What is CVE-2026-21919?

CVE-2026-21919 is a medium-severity vulnerability in Juniper Junos, classified under CWE-821. CVSS score: 6.5/10. Published 2026-04-09.

How severe is CVE-2026-21919?

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

Vulnerability in Juniper Junos

CVE-2026-21919

An Incorrect Synchronization vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos OS Evolved allows a network-based attacker with low privileges to cause a complete Denial-of-Service (DoS) of the management p…

EPSS: 0.002 (13.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

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

Affected products

Juniper Junos — versions 23.4, 24.2, 24.4
Juniper Junos_os_evolved — versions 23.4, 24.2, 24.4
Juniper Networks Junos Os — versions 23.4, 24.2, 24.4
Juniper Networks Junos Os Evolved — versions 23.4, 24.2, 24.4

Weakness classification (CWE)

CWE-821

References

sirt@juniper.net (vendor-advisory, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2026-21919?: CVE-2026-21919 is a medium-severity vulnerability in Juniper Junos, classified under CWE-821. CVSS score: 6.5/10. Published 2026-04-09.
How severe is CVE-2026-21919?: Medium severity. CVSS v3 base score is 6.5 out of 10.