CVE-2023-36845
Published: November 13, 2023
Official Description
Juniper Junos OS on EX Series and SRX Series contains a PHP external variable modification vulnerability that allows an unauthenticated, network-based attacker to control an important environment variable. Using a crafted request, which sets the variable PHPRC, an attacker is able to modify the PHP execution environment allowing the injection und execution of code.
CISA KEV Advisory
Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability
Juniper Junos OS on EX Series and SRX Series contains a PHP external variable modification vulnerability that allows an unauthenticated, network-based attacker to control an important environment variable. Using a crafted request, which sets the variable PHPRC, an attacker is able to modify the PHP execution environment allowing the injection und execution of code.
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Risk Analysis
Juniper Junos OS on EX Series and SRX Series devices has a PHP external variable modification vulnerability. An unauthenticated, network-based attacker can control the PHPRC environment variable to inject and execute code. The high EPSS score of 0.94355 indicates a very high likelihood of exploitation, and its inclusion in the KEV catalog confirms active exploitation.
This vulnerability is actively exploited in the wild. The flaw allows an unauthenticated, network-based attacker to remotely inject and execute code by manipulating PHP environment variables.
Apply the latest security updates for Juniper Junos OS on EX Series and SRX Series to address this PHP external variable modification vulnerability. Implement network segmentation and restrict access to affected devices.
Technical Analysis
CVE-2023-36845 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2023-36845 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Affected Vendors & Products
Exploit & PoC Resources
All References (2)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-36845 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1