What is CVE-2026-57031?

CVE-2026-57031 is a medium-severity vulnerability in Juniper Networks Junos Os, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 4.7/10. Published 2026-07-09.

How severe is CVE-2026-57031?

Medium severity. CVSS v3 base score is 4.7 out of 10.

Vulnerability in Juniper Networks Junos Os

CVE-2026-57031

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…

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N.

Affected products

Juniper Networks Junos Os — versions 23.2R2-S1, 23.4R2, 24.2

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

References

sirt@juniper.net (vendor-advisory)

Frequently asked questions

What is CVE-2026-57031?: CVE-2026-57031 is a medium-severity vulnerability in Juniper Networks Junos Os, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 4.7/10. Published 2026-07-09.
How severe is CVE-2026-57031?: Medium severity. CVSS v3 base score is 4.7 out of 10.