CVE-2023-36845
9.8, critical Known exploitedJuniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability
- CVSS
- 9.8, critical critical CVSS v3.1
- EPSS, next 30 days
- 95% higher than 99.8% of scored CVEs
- Exploitation
- Confirmed in the wild
- Published
- 17 Aug 20233 years ago
Known exploited
CISA added this to the Known Exploited Vulnerabilities Catalog on 13 Nov 2023. US federal agencies had to remediate by 17 Nov 2023, a deadline that has passed.
Required action. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Description
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.
Details
- Vendor
- Juniper
- Product
- Junos OS
- Weakness
- CWE-473 (opens in a new tab)
- Status
- Analyzed
- Updated
- 17 Jun 2026
- Assigner
- sirt@juniper.net
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References 4
Exploit code 2
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other Juniper CVEs
Every Juniper CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2025-21590 Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability KEV EPSS 2% 4.4, medium
- CVE-2023-36851 Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability KEV EPSS 1% 5.3, medium
- CVE-2023-36844 Juniper Junos OS EX Series PHP External Variable Modification Vulnerability KEV EPSS 90% 5.3, medium
- CVE-2023-36846 Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability KEV EPSS 93% 5.3, medium
- CVE-2023-36847 Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability KEV EPSS 83% 5.3, medium
- CVE-2020-1631 Juniper Junos OS Path Traversal Vulnerability KEV EPSS 5% 9.8, critical
- CVE-2015-7755 Juniper ScreenOS Improper Authentication Vulnerability KEV EPSS 61% 9.8, critical
Beyond this page
Is CVE-2023-36845 in your network?
This page tells you how dangerous CVE-2023-36845 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
CVE-2023-36845 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.
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EXYS7600 OCELOT
Find it before attackers do
Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2023-36845 comes with the devices to patch.
Learn more about EXYS7600 OCELOT -
EXYS7950 KONDRA
Detect it if it's exploited
Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.
Learn more about EXYS7950 KONDRA
Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.