November 13, 2023 · Applied Cybernetics Group
CVE-2023-36844 — Juniper Junos OS
Juniper Junos OS EX Series PHP External Variable Modification Vulnerability
- Added to KEV
2023-11-13- Federal due date
2023-11-17- Vendor
- Juniper
- Product
- Junos OS
- EPSS
- 99.9th percentile (score 0.942, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-36844
CISA short description
Juniper Junos OS on EX Series contains a PHP external variable modification vulnerability that 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.
Required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.