CVE-2023-36845Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to control an important environment variable
Updated under an hour ago ()
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It affects Juniper Networks Junos OS and 1 other product. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Nov 13, 2023; federal agencies had to remediate by Nov 17, 2023. Treat that date as your deadline.
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A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series and SRX Series allows an unauthenticated, network-based attacker to remotely execute code. 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. This issue affects Juniper Networks Junos OS on EX Series and SRX 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 22.3R2-S2, 22.3R3-S1; * 22.4 versions prior to 22.4R2-S1, 22.4R3; * 23.2 versions prior to 23.2R1-S1, 23.2R2.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-473
- Known exploited
- Added to CISA KEV Nov 13, 2023; federal remediation due Nov 17, 2023Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- EPSS (exploitation in the next 30 days)
- 95.07% (percentile 100)
- Assigned by
- juniper
- NVD analysis
- Analyzed
- Record last updated
- Oct 21, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Juniper Networks Junos OS juniper_networks:junos_os (from the name) | before 20.4R3-S9; from 21.1 before 21.1*; from 21.2 before 21.2R3-S7; from 21.3 before 21.3R3-S5; from 21.4 before 21.4R3-S5; from 22.1 before 22.1R3-S4; from 22.2 before 22.2R3-S2; from 22.3 before 22.3R2-S2, 22.3R3-S1; and 2 more ranges | CNA record |
juniper junos juniper:junos | before 20.4; 20.4; 20.4; 20.4; 20.4; 20.4; 20.4; 20.4; and 85 more ranges | NVD |
References
- https://supportportal.juniper.net/JSA72300vendor-advisory, mitigation
- http://packetstormsecurity.com/files/174865/Juniper-SRX-Firewall-EX-Switch-Remote-Code-Execution.htmlexploit, third-party-advisory, vdb-entry
- http://packetstormsecurity.com/files/176969/Juniper-SRX-Firewall-EX-Switch-Remote-Code-Execution.htmlexploit, third-party-advisory, vdb-entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-36845us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.