Juniper Junos OS Authentication for Critical Function (CVE-2024-21620)

high Nessus Plugin ID 215002

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Synopsis

The remote device is missing a vendor-supplied security patch.

Description

The version of Junos OS installed on the remote host is affected by a vulnerability as referenced in the JSA76390 advisory.

- An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in J-Web of Juniper Networks Junos OS on SRX Series and EX Series allows an attacker to construct a URL that when visited by another user enables the attacker to execute commands with the target's permissions, including an administrator. A specific invocation of the emit_debug_note method in webauth_operation.php will echo back the data it receives. (CVE-2024-21620)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Apply the relevant Junos software release referenced in Juniper advisory JSA76390

Plugin Details

Severity: High

ID: 215002

File Name: juniper_jsa76390_CVE-2024-21620.nasl

Version: 1.3

Type: Combined

Family: Junos Local Security Checks

Published: 2/5/2025

Updated: 4/22/2026

Supported Sensors: Nessus

Risk Information

CVSS Score Rationale: Set to score from vendor advisory.

VPR

Risk Factor: Low

Score: 3.0

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS Score Source: manual

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:juniper:junos

Required KB Items: Host/Juniper/JUNOS/Version, Host/Juniper/model

Exploit Ease: No known exploits are available

Patch Publication Date: 1/25/2024

Vulnerability Publication Date: 1/25/2024

CISA Known Exploited Vulnerability Due Dates: 11/17/2023

Reference Information

CVE: CVE-2024-21620

JSA: JSA76390

Detections

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