Is CVE-2026-21916 being actively exploited?

CVE-2026-21916 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-21916?

CVE-2026-21916 has a CVSS 3.1 base score of 7.3 (HIGH).

CVE-2026-21916

HIGH · CVSS 7.3EPSS 0.1%EU EUVD

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.

Key facts

CVSS score: 7.3 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-61
EPSS score: 0.1% (2th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-21080)
Published: April 9, 2026
NVD last modified: June 17, 2026
Status: Analyzed

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-21080 in the EU Vulnerability Database. Last updated in EUVD on April 13, 2026.

View on the EU Vulnerability Database

Affected products

juniper / junos
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Certified products that may be affected

6 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Juniper SRX Series and vSRX for Junos OS 24.4R1 - Juniper Networks, Inc. - Common Criteria Certificate Number: 2026/163 - active
Junos Space Network Management Platform, with or without Network Director and with or without Security Director in JA2500 - Juniper Networks, Inc. - FIPS 140 3816 - historical
Juniper Networks SRX345/SRX345-DUAL-AC with Junos 15.1X49-D110 - Juniper Networks, Inc. - FIPS 140 3247 - historical
Junos-FIPS 10.4 L2 OS Cryptographic Module - Juniper Networks, Inc. - FIPS 140 1813 - historical
Junos-FIPS 10.4 L1 OS Cryptographic Module - Juniper Networks, Inc. - FIPS 140 1772 - historical

See all 6 in the Security Certifications Explorer.

References

https://kb.juniper.net/JSA107807(Mitigation, Vendor Advisory)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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