Juniper — known exploited vulnerabilities
The CISA Known Exploited Vulnerabilities catalog (KEV) lists vulnerabilities that CISA has confirmed are being exploited in the wild; U.S. federal civilian agencies are required to remediate each entry by its due date. This page joins the KEV entries for Juniper with NVD CVSS scores and CISA's ransomware-campaign flag. See our methodology or browse all CVEs.
Key findings
CISA's Known Exploited Vulnerabilities catalog lists 8 Juniper vulnerabilities confirmed as exploited in the wild across 2 products; none are currently flagged as used in known ransomware campaigns. Junos OS is the most-affected product, with 7 entries (88% of the total). CISA added 2 entries in 2025, compared with 0 in 2024. Across the 8 entries with an NVD CVSS score (100% of the total), the average score is 6.8; 2 entries are rated critical by NVD. The most recent addition is CVE-2015-7755 (Juniper ScreenOS Improper Authentication Vulnerability), added on 2025-10-02.
Affected products
| Product | Entries | Share |
|---|---|---|
| Junos OS | 7 | 88% |
| ScreenOS | 1 | 13% |
Entries added per year
By date added to the KEV catalog
Exploited Juniper vulnerabilities (8)
Newest first. CVSS scores from NVD where available.
| CVE | Product | Vulnerability | Date added | Ransomware | CVSS |
|---|---|---|---|---|---|
| CVE-2015-7755 | ScreenOS | Juniper ScreenOS Improper Authentication Vulnerability | 2025-10-02 | — | CRITICAL9.8 |
| CVE-2025-21590 | Junos OS | Juniper Junos OS Improper Isolation or Compartmentalization Vulnerability | 2025-03-13 | — | MEDIUM4.4 |
| CVE-2023-36844 | Junos OS | Juniper Junos OS EX Series PHP External Variable Modification Vulnerability | 2023-11-13 | — | MEDIUM5.3 |
| CVE-2023-36845 | Junos OS | Juniper Junos OS EX Series and SRX Series PHP External Variable Modification Vulnerability | 2023-11-13 | — | CRITICAL9.8 |
| CVE-2023-36846 | Junos OS | Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability | 2023-11-13 | — | MEDIUM5.3 |
| CVE-2023-36847 | Junos OS | Juniper Junos OS EX Series Missing Authentication for Critical Function Vulnerability | 2023-11-13 | — | MEDIUM5.3 |
| CVE-2023-36851 | Junos OS | Juniper Junos OS SRX Series Missing Authentication for Critical Function Vulnerability | 2023-11-13 | — | MEDIUM5.3 |
| CVE-2020-1631 | Junos OS | Juniper Junos OS Path Traversal Vulnerability | 2022-03-25 | — | HIGH8.8 |
Source: CISA Known Exploited Vulnerabilities catalog, joined with NIST NVD CVSS data. Vendor names are normalized across spellings. Compare all vendors.