CVE-2026-101980 Juniper Networks Junos OS - Denial of Service

Juniper Networks Junos OS kernel with Extended Echo configured contains an integer underflow caused by improper input handling, letting unauthenticated network attackers cause denial of service via kernel crash, exploit requires Extended Echo configuration.

CVSS base score 9.8 /10
Critical
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:H/I:H/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-191

Vendor fix

Update to the latest Junos OS version 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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