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CVE-2015-7755: Juniper ScreenOS Improper Authentication Vulnerability

criticalknown exploitedpublic exploitCVE-2015-7755
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Juniper ScreenOS contains an improper authentication vulnerability that could allow unauthorized remote administrative access to the device.

CSIRTS triage

vendor: Juniperproduct: ScreenOSAuthentication bypass
What
The vulnerability allows unauthorized remote administrative access to the device.
Who is affected
Deployments of Juniper ScreenOS devices.
Urgency
Remediation is critical due to active exploitation and the potential for unauthorized access.
Action
Apply the latest security patches for ScreenOS.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2025-10-02
Exploitation
Observed in the wild (CISA KEV)

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2015-7755coverage & exploitation statusNVD · CVE.org

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