CVE-2026-101979 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 specific SNMP packets in authd, letting network attackers with SNMP read access execute code with root privileges or cause denial of service, exploit requires SNMP and AAA enabled.

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

Details

Type
Buffer Overflow
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/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 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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