CVE-2026-102027 Juniper Networks Junos OS - Denial of Service

Juniper Networks Junos OS and Junos OS Evolved contain a denial of service caused by incorrect buffer size calculation in the routing protocol daemon (rpd), letting configured eBGP neighbors crash rpd via BGP labeled-unicast UPDATEs when multipath features are enabled, exploit requires configured eBGP neighbor.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-131

Vendor fix

Update to the latest Junos OS and Junos OS Evolved versions with the fix applied.

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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