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CVE-2026-57031 is a medium severity vulnerability with a CVSS score of 4.7. No known exploits currently, and patches are available.
Very low probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
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:
| Vendor | Product |
|---|---|
| Juniper | Junos |
| Juniper |
Please cite this page when referencing data from Strobes VI. Proper attribution helps support our vulnerability intelligence research.
| Mx304 |
| Juniper | Mpc10e 15c |
| Juniper | Mpc10e 10c |
| Juniper | Lc9600 |
| Juniper | Lc4802 |
| Juniper | Lc4800 |
| Juniper | Mpc11 |