CVE-2026-33798 Juniper Networks Junos OS - Buffer Overflow

Juniper Networks Junos OS and Junos OS Evolved on SRX Series contain a stack-based buffer overflow caused by improper handling in srxpfe, letting L2-adjacent attackers execute arbitrary code as root via high-availability fabric traffic, exploit requires L2 adjacency.

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, Privilege Escalation
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 Junos OS and Junos OS Evolved versions.

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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