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CVE-2026-21916 is a local privilege escalation vulnerability in the Juniper Networks Junos OS CLI caused by unsafe handling of symbolic links during CLI file operations and subsequent configuration commits. A low-privileged authenticated local user can perform a specific 'file link' CLI operation to create conditions for exploitation. When another authenticated user later performs a configuration commit, even if the commit is unrelated, the privileged commit process follows the attacker-controlled symbolic link in a root execution context. This improper symlink resolution can alter system state in a way that allows the original attacker to subsequently log in as root. The flaw affects multiple Junos OS release trains prior to vendor-fixed versions and can result in full system compromise.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.