CVE-2026-103994 Juniper Networks Junos OS - Heap-based Buffer Overflow

Juniper Networks Junos OS contains a heap-based buffer overflow caused by improper handling in VXLAN Gateway Daemon (vgd), letting malicious or compromised SDN-controller cause outage or remote code execution, exploit requires malicious SDN-controller.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Heap-based Buffer Overflow
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-122

Vendor fix

Update to the latest Junos OS version containing the fix.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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