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CVE-2026-57031

MEDIUM
4.7
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-57031
State
PUBLISHED
Assigner
juniper
Reserved
2026-06-23 16:27 UTC
Published
2026-07-09 21:13 UTC
Last updated
2026-07-09 21:13 UTC
Primary CWE
CWE-754
CWE-754 Improper Check for Unusual or Exceptional Conditions
Vendor / Product
Juniper Networks / Junos OS
Sources
cve.org  ·  NVD

Severity & Metrics

4.7 MEDIUM CVSS 3.1
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Affected products (1)
VendorProductPlatformVersions
Juniper Networks Junos OS MX Series 23.2R2-S1 < 23.2R2-S7, 23.4R2 < 23.4R2-S7, 24.2 < 24.2R2-S3, 24.4 < 24.4R2-S2 …
Weakness (CWE)
CWESourceDescription
CWE-754 cna CWE-754 Improper Check for Unusual or Exceptional Conditions
CVSS scores (2)
ScoreSeverityVersionSourceVector
5.3 MEDIUM 4.0 cna CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/AU:Y/RE:M
4.7 MEDIUM 3.1 cna CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
References (1)
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