What is CVE-2026-21901?

CVE-2026-21901 is a medium-severity vulnerability in Juniper Networks Junos Os, classified under NULL Pointer Dereference. CVSS score: 4.4/10. Published 2026-07-09.

How severe is CVE-2026-21901?

Medium severity. CVSS v3 base score is 4.4 out of 10.

NULL pointer dereference in Juniper Networks Junos Os

CVE-2026-21901

A NULL Pointer Dereference vulnerability in the management daemon (mgd) of Juniper Networks Junos OS and Junos OS Evolved allows a local, high-privileged attacker setting or deactivating a specific SSH configuration parameter to create a D…

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

Affected products

Juniper Networks Junos Os — versions 22.3, 22.4, 23.2
Juniper Networks Junos Os Evolved — versions 23.2, 23.4, 0

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

sirt@juniper.net (third-party-advisory)
sirt@juniper.net (vendor-advisory)

Frequently asked questions

What is CVE-2026-21901?: CVE-2026-21901 is a medium-severity vulnerability in Juniper Networks Junos Os, classified under NULL Pointer Dereference. CVSS score: 4.4/10. Published 2026-07-09.
How severe is CVE-2026-21901?: Medium severity. CVSS v3 base score is 4.4 out of 10.