CVE-2026-57031 — Junos OS: MX Series: For subscribers configured on static interfaces, input filters are not in effect

Description (CNA)

An Improper Check for Unusual or Exceptional Conditions vulnerability in the packet forwarding engine (PFE) of Juniper Networks Junos OS on MX Series allows adjacent subscribers to bypass configured firewall filters. On MX Series devices with MPC10/11, LC4800/9600, and MX304 with subscribers configured on static interfaces, ingress firewall filters are not enforced, so that neither protocol level nor upstream bandwidth limitation are in effect. This issue affects Junos OS on MX with MPC10/11, LC4800/9600/4802, and MX304: * 23.2 versions from 23.2R2-S1 before 23.2R2-S7, * 23.4 versions from 23.4R2 before 23.4R2-S7, * 24.2 versions before 24.2R2-S3, * 24.4 versions before 24.4R2-S2, * 25.2 versions before 25.2R2.

Affected (CNA)

Vendor / product	Versions
Juniper Networks / Junos OS	affected 23.2R2-S1 before 23.2R2-S7; affected 23.4R2 before 23.4R2-S7; affected 24.2 before 24.2R2-S3; affected 24.4 before 24.4R2-S2; affected 25.2 before 25.2R2

CWE

CWE-754

References

https://supportportal.juniper.net/JSA110091

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.