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CVE-2026-57027 is a medium severity vulnerability with a CVSS score of 6.5. 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.
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:
| Vendor | Product |
|---|---|
| Juniper | Junos |
| Juniper |
Please cite this page when referencing data from Strobes VI. Proper attribution helps support our vulnerability intelligence research.
| Ex4400 |
| Juniper | Ex4100 F |
| Juniper | Ex4100 |
| Juniper | Ex4100 H 12t |
| Juniper | Ex4100 H |