Exploited vulnerability · CISA KEV

Is CVE-2015-7755 exploited? Yes: in CISA KEV since 2 Oct 2025

Gociux · Juniper ScreenOS · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2015-7755, Juniper ScreenOS Improper Authentication Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 2 Oct 2025, 3575 days after it was published. It affects Juniper ScreenOS. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

What it is

Juniper ScreenOS contains an improper authentication vulnerability that could allow unauthorized remote administrative access to the device.

What to do

1. Check whether you run it. Look for ScreenOS in your asset inventory, including appliances and cloud images. Stack check lists every exploited Juniper CVE at once.
2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 19 Dec 2015.
4. Get told next time. Email alerts when CISA adds a CVE for Juniper.

References

• supportportal.juniper.net/s/article/2015-12-Out-of-Cycle-Security-Bulletin-ScreenOS-M
• nvd.nist.gov/vuln/detail/CVE-2015-7755

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in October 2025 · Juniper scorecard · act-now radar.