Actively exploited in the wild
Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability
Juniper — Junos OS · Listed in the CISA KEV since 2023-11-13. This indicates confirmed attacks in production environments.
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
CVE-2023-36846
MediumCVSS 5.3KEVExploitation Probability (EPSS)
Very high risk100th percentile — higher than 100% of all known CVEs
Summary
A Missing Authentication for Critical Function vulnerability in Juniper Networks Junos OS on SRX Series allows an unauthenticated attacker to upload arbitrary files via J-Web, leading to a loss of file system integrity.
Risk Assessment
An attacker could exploit this vulnerability to introduce malicious files, potentially leading to further attacks on the system. The loss of file system integrity may affect the stability and security of the entire infrastructure.
Recommendation
It is recommended to update Junos OS to a version that is not vulnerable to this issue to secure the system against potential attacks.
Original NVD description (English source)
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.