CVE-2026-57027 — Junos OS: EX4100 Series, EX4400: With sFlow configured in a VC scenario multicast traffic leads to an FPC crash

Description (CNA)

A Missing Release of Memory after Effective Lifetime vulnerability in the packet forwarding engine (pfe) of Juniper Networks Junos OS on specific EX Series devices allows an unauthenticated adjacent attacker to cause a Denial-of-Service (DoS).When sFlow is configured in a Virtual Chassis (VC) scenario with EX4100 Series or EX4400 Series devices, multicast traffic which is received on one VC member and sent out on another member leads to a memory leak and ultimately an FPC crash and restart. The leak can be monitored by watching the continuous increase of the buffer values in the output of: user@host> show chassis fpc This issue affects Junos OS on EX4100 Series and EX4400: * all versions before 23.2R2-S7, * 23.4 versions before 23.4R2-S7, * 24.2 versions before 24.2R2-S4, * 24.4 versions before 24.4R2.

Affected (CNA)

Vendor / product	Versions
Juniper Networks / Junos OS	affected 0 before 23.2R2-S7; affected 23.4 before 23.4R2-S7; affected 24.2 before 24.2R2-S4; affected 24.4 before 24.4R2

CWE

CWE-401

References

https://supportportal.juniper.net/JSA110087

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.