Trusted Design

Juniper Screenos Backdoor Password Seen Used in the Wild

概要

Starting on December 22nd sensors that are part of the Modern Honey Network (MHN) started detecting several systems using the recently reported Juniper ScreenOS backdoor password (<<< %s(un='%s') = %u as reported by Rapid7 here). This backdoor is identified as CVE-2015-7755. It allows anyone to gain administrative access to a Juniper Netscreen device by using either telnet or SSH and using the hard coded backdoor password with any username. This backdoor affects ScreenOS versions 6.2.0r15 to 6.2.0r18 and 6.3.0r12 to 6.3.0r20 and a patch is currently available.

Created: 2026-02-23

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