Vulnerability in Juniper Junos
CVE-2026-21916
A UNIX Symbolic Link (Symlink) Following vulnerability in the CLI of Juniper Networks Junos OS allows a local, authenticated attacker with low privileges to escalate their privileges to root which will lead to a complete compromise of the system. When after a user has performed a specific 'file link ...' CLI operation, another user commits (unrelated configuration changes), the first user can login as root. This issue affects Junos OS: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S6, * 24.2 versions before 24.2R2-S3, * 24.4 versions before 24.4R2-S2, * 25.2 versions before 25.2R2. This issue does not affect versions 25.4R1 or later.
EPSS: 0.001 (2.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Juniper Junos — versions 23.2, 23.4, 24.2
- Juniper Networks Junos Os — versions 0, 23.4, 24.2
Weakness classification (CWE)
References
- sirt@juniper.net (vendor-advisory, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-21916?
- CVE-2026-21916 is a high-severity vulnerability in Juniper Junos, classified under UNIX Symbolic Link (Symlink) Following. CVSS score: 7.3/10. Published 2026-04-09.
- How severe is CVE-2026-21916?
- High severity. CVSS v3 base score is 7.3 out of 10.