CVE-2021-31349

Session Smart Router: Authentication Bypass Vulnerability

CRITICAL
9.8
CVSS Score
Published: October 19, 2021 at 06:16 PM UTC
Updated: June 17, 2026 at 03:51 AM UTC
3 products affected across 2 vendors128 Technology Session Smart Router FirmwareSession Smart Router128 Technology Session Smart Router

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Severity
CRITICAL9.8
Exploit prediction
EPSS 2%

Description

The usage of an internal HTTP header created an authentication bypass vulnerability (CWE-287), allowing an attacker to view internal files, change settings, manipulate services and execute arbitrary code. This issue affects all Juniper Networks 128 Technology Session Smart Router versions prior to 4.5.11, and all versions of 5.0 up to and including 5.0.1.

Affected

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

v < 4.5.115.0.0 ≤ v ≤ 5.0.1
Affected range stops below 4.5.11, so it looks safe — our inference, not a vendor statement
juniper-128-technology-session-smart-router (same device)
v < 4.5.115.0 ≤ v ≤ 5.0.15.0
Affected range stops below 4.5.11, so it looks safe — our inference, not a vendor statement
All versions

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)

x_refsource_CONFIRMVendor Advisory
https://kb.juniper.net/JSA11256

CVSS

9.8CRITICALjuniper
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287NVD-CWE-noinfo

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