VulnSocial

CVE-2026-57031General(juniper / junos)

LOWCVSS 5.3 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.5/ 10 priority

Sources & remediation

Vendor / third-party advisories
Weakness type (CWE)
CWE-754

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • junos
  • lc4800
  • lc4802
  • lc9600

Threat summary

  • 1 mentions across 1 observed day

What's happening

  • General: 1 classified signal
  • 1 total mentions across 1 day

Affected systems

Vendors
juniper
Products
junoslc4800lc4802lc9600mpc10e-10cmpc10e-15cmpc11mx304

6 versions affected across 8 products

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-08-26: 108-26
Signal classification1 categories
General
1100.0%
Referenced assets1 URL
Full discourse1 post
  • DailyCVE@dailycve
    General

    🟠 Juniper MX Series, Firewall Bypass, #CVE-2026-57031 (MEDIUM) -DC-Aug2026-1924 https://dailycve.com/juniper-mx-series-firewall-bypass-cve-2026-57031-medium-dc-aug2026-1924/

    Post summary

    The entry announces CVE-2026-57031 as a medium‑severity firewall bypass for Juniper MX Series, but provides no PoC, exploit details, patch information, or technical specifics.

    0000088
    231 followersView on X
CPE platform detail37 entries

37 of 37 entries

PartVendorProductVersionTarget SWTarget HW
OSjuniperjunos23.2--
OSjuniperjunos23.2--
OSjuniperjunos23.2--
OSjuniperjunos23.2--
OSjuniperjunos23.2--
OSjuniperjunos23.2--
OSjuniperjunos23.4--
OSjuniperjunos23.4--
OSjuniperjunos23.4--
OSjuniperjunos23.4--
OSjuniperjunos23.4--
OSjuniperjunos23.4--
OSjuniperjunos23.4--
OSjuniperjunos24.2--
OSjuniperjunos24.2--
OSjuniperjunos24.2--
OSjuniperjunos24.2--
OSjuniperjunos24.2--
OSjuniperjunos24.2--
OSjuniperjunos24.2--
OSjuniperjunos24.4--
OSjuniperjunos24.4--
OSjuniperjunos24.4--
OSjuniperjunos24.4--
OSjuniperjunos24.4--
OSjuniperjunos24.4--
OSjuniperjunos25.2--
OSjuniperjunos25.2--
OSjuniperjunos25.2--
OSjuniperjunos25.2--
HWjuniperlc4800---
HWjuniperlc4802---
HWjuniperlc9600---
HWjunipermpc10e-10c---
HWjunipermpc10e-15c---
HWjunipermpc11---
HWjunipermx304---

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