CVE entry · CVE-2015-7755
CVE-2015-7755: Juniper ScreenOS Improper Authentication Vulnerability
Juniper ScreenOS contains an improper authentication vulnerability that could allow unauthorized remote administrative access to the device.
- Actively exploited: added to CISA’s KEV catalog on October 2, 2025.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: October 23, 2025.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes Juniper ScreenOS, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (supportportal.juniper.net)
- NVD entry (NIST)
- CISA KEV catalog