CVE-2026-57031
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
56/100
Published: 2026-07-09
Modified: 2026-10-25
First seen: 2026-10-29
Status: active
Attack Surface
Adjacent
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Adjacent
AC:
Low
PR:
None
UI:
None
S:
X
AT:
None
VC:
None
VI:
None
VA:
None
Description
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.
Weakness Classification (1)
Affected Software (30)
| Vendor | Product | Version |
|---|---|---|
| juniper | junos | 23.2 |
| juniper | junos | 23.2 |
| juniper | junos | 23.2 |
| juniper | junos | 23.2 |
| juniper | junos | 23.2 |
| juniper | junos | 23.2 |
| juniper | junos | 23.4 |
| juniper | junos | 23.4 |
| juniper | junos | 23.4 |
| juniper | junos | 23.4 |
| juniper | junos | 23.4 |
| juniper | junos | 23.4 |
| juniper | junos | 23.4 |
| juniper | junos | 24.2 |
| juniper | junos | 24.2 |
| juniper | junos | 24.2 |
| juniper | junos | 24.2 |
| juniper | junos | 24.2 |
| juniper | junos | 24.2 |
| juniper | junos | 24.2 |
| juniper | junos | 24.4 |
| juniper | junos | 24.4 |
| juniper | junos | 24.4 |
| juniper | junos | 24.4 |
| juniper | junos | 24.4 |
| juniper | junos | 24.4 |
| juniper | junos | 25.2 |
| juniper | junos | 25.2 |
| juniper | junos | 25.2 |
| juniper | junos | 25.2 |
References & Advisories (1)
Vendor Advisory