Home/CVE/Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability
CVE

CVE-2023-36846

Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability

A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX Series allows an unauthenticated, network-based attacker to cause limited impact to the file system integrity. With a specific request to user.php that doesn't require authentication an attacker is able to upload arbitrary files via J-Web, leading to a loss of integrity for a certain part of the file system, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on SRX Series: All versions prior to 20.4R3-S8; 21.1 versions 21.1R1 and later; 21.2 versions prior to 21.2R3-S6; 21.3 versions prior to 21.3R3-S5; 21.4 versions prior to 21.4R3-S5; 22.1 versions prior to 22.1R3-S3; 22.2 versions prior to 22.2R3-S2; 22.3 versions prior to 22.3R2-S2, 22.3R3; * 22.4 versions prior to 22.4R2-S1, 22.4R3.

MEDIUM · CVSS 5.3 ⚠ CISA KEV EPSS 0.94278
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • SSVC automatable: yes - attacks can be scripted at scale
Sigma rules0 YARA rules0
⬢

Required Remediation

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

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Weakness Classification

CWE-306Missing Authentication for Critical Function
CWE-306Missing Authentication for Critical Function
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Affected Products & Versions

2
juniper junos< 20.4
juniper junosall versions
◈

Detection Rules (IDS/IPS)

2
et-openET EXPLOIT Junos OS - Unauthenticated Arbitrary File Upload Attempt (CVE-2023-36851)attempted-admin
et-openET EXPLOIT Junos OS - Successful Unauthenticated Arbitrary File Upload Attempt (CVE-2023-36851)successful-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · sirt@juniper.net
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD17 Aug 2023 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC triage · cisa-vulnrichment
Exploitation
active
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

2
cisaKEV-CVE-2023-36846
splunk-security-content6cc4cc3d-b10a-4fac-be1e-55d384fc690e
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://supportportal.juniper.net/JSA72300Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36846US Government Resource
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