PatchTheCVECVE-2026-57019: An Improper Validation of Specified Quantity in Input vulnerability in the Packet Forwarding Engine (pfe) of J
CVE-2026-57019 is a medium-severity flaw (CVSS 6.5) affecting junos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An Improper Validation of Specified Quantity in Input vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on MX Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS). When a specific packet is received from device in the same broadcast domain, an affected system calculates the packet size incorrectly. This causes further packet processing to fail, which triggers an FPC major error, r
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.5 (Medium) |
| Attack vector | Adjacent network |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 81%) |
| CISA exploited list | No |
| Weakness | CWE-1284 |
| Published | 2026-07-09 |
| Last modified | 2026-10-25 |
Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-57019?
junos: upgrade to 23.2. Exact commands for each OS are on this page.
Is CVE-2026-57019 being exploited?
CVE-2026-57019 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-57019 affect?
CVE-2026-57019 affects junos. Severity is medium (CVSS 6.5). An Improper Validation of Specified Quantity in Input vulnerability in the Packet Forwarding Engine (pfe) of Juniper Networks Junos OS on MX Series allows an unauthenticated, adjacent attacker to cause a Denial-of-Service (DoS). When a sp
How urgent is CVE-2026-57019?
Priority 27/100. No elevated risk signals yet.
Software pages
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