Juniper ScreenOS SSH / Telnet Authentication Backdoor

Critical Nessus Plugin ID 87601


An account on the remote host uses a known password.


The account 'netscreen' on the remote host has the password '<<< %s(un='%s') = %u', a known backdoor password. The affected devices are firewalls and VPN gateways. A remote attacker can exploit this vulnerability to gain administrative access and monitor network traffic, deny network access, and alter device and firewall configurations.


Upgrade to Juniper ScreenOS 6.2.0r19 / 6.3.0r21 or later.
Alternatively, apply the appropriate patch referenced in the vendor advisory.

See Also

Plugin Details

Severity: Critical

ID: 87601

File Name: screenos_ssh_auth_bypass.nasl

Version: 1.10

Type: remote

Published: 2015/12/23

Updated: 2018/07/27

Dependencies: 55900, 10267, 10281

Risk Information

Risk Factor: Critical

CVSS v2.0

Base Score: 10

Temporal Score: 7.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Temporal Vector: CVSS2#E:U/RL:TF/RC:C

CVSS v3.0

Base Score: 9.8

Temporal Score: 8.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:T/RC:C

Vulnerability Information

Excluded KB Items: global_settings/supplied_logins_only

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/12/17

Vulnerability Publication Date: 2015/12/17

Reference Information

CVE: CVE-2015-7755

BID: 79626

JSA: JSA10713

CERT: 640184