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CVE Record

CVE-2016-4923: Junos J-Web: Cross Site Scripting Vulnerability

Insufficient cross site scripting protection in J-Web component in Juniper Networks Junos OS may potentially allow a remote unauthenticated user to inject web script or HTML and steal sensitive data and credentials from a J-Web session and to perform administrative actions on the Junos device. Juniper SIRT is not aware of any malicious exploitation of this vulnerability. Affected releases are Juniper Networks Junos OS 11.4 prior to 11.4R13-S3; 12.1X44 prior to 12.1X44-D60; 12.1X46 prior to 12.1X46-D40; 12.1X47 prior to 12.1X47-D30; 12.3 prior to 12.3R11; 12.3X48 prior to 12.3X48-D20; 13.2X51 prior to 13.2X51-D39, 13.2X51-D40; 13.3 prior to 13.3R9; 14.1 prior to 14.1R6; 14.2 prior to 14.2R6; 15.1 prior to 15.1R3; 15.1X49 prior to 15.1X49-D20; 15.1X53 prior to 15.1X53-D57.

HighCVSS 8Not KEV-listedUpdated
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Glexia's TakeAutomated analysis

Security readout for executives and security teams

CVE-2016-4923 is a high-severity flaw in Juniper Junos OS J-Web. An attacker could inject browser-executed content into a J-Web session, potentially stealing sensitive data or credentials and causing administrative actions on the device. Exposure is limited to Juniper Junos OS devices running affected releases with J-Web present, especially where the management interface is reachable by users or networks beyond tightly controlled administration paths. Treat as high priority for network infrastructure. Business urgency rises sharply if J-Web is exposed to broad internal networks or the internet, because compromised administrative sessions can affect critical routing, firewall, or security operations. Mitigation focus: Upgrade affected Junos OS releases to the fixed versions listed by Juniper.; Review Juniper JSA10764 for vendor-supported remediation guidance.; Prioritize devices with reachable J-Web management interfaces..

Prepared

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2016-4923 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
8 (3.0)
Known Exploited
No
Published

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
8CVSS 3.0HighCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H2.15.9Primary CVE score

Vulnerability scoring details

Base CVSS 3.0 score

8High
CVSS 3.0 vector shape for CVE-2016-4923Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Juniper NetworksJunos OS11.4 prior to 11.4R13-S3, 12.1X44 prior to 12.1X44-D60, 12.1X46 prior to 12.1X46-D40, 12.1X47 prior to 12.1X47-D30, 12.3 prior to 12.3R11, 12.3X48 prior to 12.3X48-D20, 13.2X51 prior to 13.2X51-D39, 13.2X51-D40, 13.3 prior to 13.3R9, 14.1 prior to 14.1R6, 14.2 prior to 14.2R6, 15.1 prior to 15.1R3, 15.1X49 prior to 15.1X49-D20, 15.1X53 prior to 15.1X53-D57Listed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.