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CVE-2026-57031

Junos OS: MX Series: For subscribers configured on static interfaces, input filters are not in effect

MEDIUM
4.7
CVSS Score
Published: July 9, 2026 at 09:13 PM UTC
Updated: October 25, 2026 at 03:10 PM UTC
1 product affected across 1 vendorJunos· also runs on 7 platforms

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Severity
MEDIUM4.7
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Junos· Juniper Networks
95%
23.223.2 r2-s123.2 r2-s223.2 r2-s323.2 r2-s423.2 r2-s523.2 r2-s623.2R2-S123.423.4 r223.4 r2-s123.4 r2-s223.4 r2-s323.4 r2-s423.4 r2-s523.4 r2-s623.4R224.224.2 r124.2 r1-s124.2 r1-s224.2 r224.2 r2-s124.2 r2-s224.424.4 r124.4 r1-s224.4 r1-s324.4 r224.4 r2-s125.225.2 r125.2 r1-s125.2 r1-s2
Affected range stops below 23.2R2-S7, so it looks safe — our inference, not a vendor statement
Affected range stops below 23.4R2-S7, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.2R2-S3, so it looks safe — our inference, not a vendor statement
Affected range stops below 24.4R2-S2, so it looks safe — our inference, not a vendor statement
Affected range stops below 25.2R2, so it looks safe — our inference, not a vendor statement
juniper-lc4800 (environment) · juniper-lc4802 (environment) · juniper-lc9600 (environment) · juniper-mpc10e-10c (environment) · juniper-mpc10e-15c (environment) · juniper-mpc11 (environment) · juniper-mx304 (environment)

Runs on — not affected

The affected product only carries this flaw when running on these platforms. The platforms themselves are not vulnerable.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://supportportal.juniper.net/JSA110091

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.7MEDIUMjuniper
Attack Vector
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-754

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