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CRITICAL SEVERITY
CVE-2015-7755 Juniper · ScreenOS

Juniper ScreenOS Improper Authentication Vulnerability

Technical Severity

CVSS v3.1 Metrics

CRITICAL
9.8 / 10
Minimal Risk Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Likelihood

EPSS Prediction

85.63 %
Predictive Probability
Percentile Rank
99.4 th

Documented as more likely to be exploited than 99.4% of known CVEs.

Detection Date

Oct 02, 2025

Remediation Due

Oct 23, 2025

CISA Catalog Active

Threat Analysis

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

Remediation Directive

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

External Intelligence

https://supportportal.juniper.net/s/article/2015-12-Out-of-Cycle-Security-Bulletin-ScreenOS-Multiple-Security-issues-with-ScreenOS-CVE-2015-7755-CVE-2015-7756

https://supportportal.juniper.net/s/article/2015-12-Out-of-Cycle-Security-Bulletin-ScreenOS-Multiple-Security-issues-with-ScreenOS-CVE-2015-7755-CVE-2015-7756
NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2015-7755