Actively exploited in the wild
Juniper Junos OS EX Series PHP External Variable Modification 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-2023-36844
MediumCVSS 5.3KEVExploitation Probability (EPSS)
Very high risk100th percentile — higher than 100% of all known CVEs
Summary
CVE-2023-36844 is a PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS that allows an unauthenticated attacker to modify important environment variables. An attacker can use a crafted request to change certain variables, leading to partial loss of integrity.
Risk Assessment
This vulnerability may allow attackers to chain it with other vulnerabilities, increasing the risk to the organization. Consequently, it could lead to serious security breaches.
Recommendation
It is recommended to update Junos OS to a version that is not vulnerable to this issue to minimize risk. Additionally, monitoring systems for suspicious activity is advised.
Original NVD description (English source)
A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to control certain, important environment variables. Using a crafted request an attacker is able to modify certain PHP environment variables leading to partial loss of integrity, which may allow chaining to other vulnerabilities. This issue affects Juniper Networks Junos OS on EX Series: * All versions prior to 20.4R3-S9; * 21.1 versions 21.1R1 and later; * 21.2 versions prior to 21.2R3-S7; * 21.3 versions prior to 21.3R3-S5; * 21.4 versions prior to 21.4R3-S5; * 22.1 versions prior to 22.1R3-S4; * 22.2 versions prior to 22.2R3-S2; * 22.3 versions prior to 22.3R3-S1; * 22.4 versions prior to 22.4R2-S2, 22.4R3; * 23.2 versions prior to 23.2R1-S1, 23.2R2.