CVE-2026-102049 Juniper Networks Junos OS - Buffer Overflow

Juniper Networks Junos OS and Junos OS Evolved contain a stack-based buffer overflow caused by improper handling of LLDP traffic in the l2cpd process with Unified Access Policy enabled, letting adjacent unauthenticated attackers cause denial of service or execute arbitrary code with root privileges.

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

Details

Type
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-121

Vendor fix

Update to the latest available version of Junos OS and Junos OS Evolved.

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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